Well im in the last stretch.The car is running and is running pretty strongth but i got one small problem.

At a dead stop(red light or stop)when the motor is cold or not in is operating range, if i want start quickly(wot) the car seems to hesitate a bit but its hardly noticeable.

But when its warm(normal operating range) at a dead stop and same thing,if i wanna start quickly,the car hesitate kinda bad until 1000/1200rpm and then pull really hard to 6k.

So what could it be?

 

I fixed mine with a new mass air flow, I don't know if that would be your problem, but I would get it scanned if it has a engine light on.
Note: mine didn't throw a light, i just threw parts at it till it was fixed.
good luck, I wish I could have been more help but there is so many things that would cause a miss.

 

Well i threw a lot of new parts but i ll try first to clean my mass air flow.

 

Well i ve not only clean the maf i ve also tried another one and its not the culprit.

I also tried a stock lt1 tune with calibration for my 32lbs injectors and the problem is still there.

So need help... again

 

clean out the throttle body. If they are gunky, it could hesitate. Be sure all your maintences are up to date...plugs, wires, fuel filter....many things could cause a hesitation.

 

MOTOR/IGNITION:
-Brand new 96 LT4 GM crate motor with plastic valve cover
-New GM lt1 oil pan
-96 LT4 GM intake
-New Delphi 32lbs injectors
-New Delco optispark distributor
-New msd blaster coil
-New taylor spiro wire otvc side mount
-New tr55 ngk plug
-Moroso CAI
-Brand new crank hub
-Brand new ASP crank pulley
-New rebuilt and ported(52mm) stock throttle body to avoid sticking blade with ported air foil
-New knock sensor
-New oxygen sensor(on both side with new pass side O2 extension)
-New coolant sensor(both: on head to gauge and on water pump to ecm)
-New oil pressure sensor with new angle fitting
-New throttle cable(no traction control)
-New rebuilt stock water pump
-New power steering pump
-New poly motor mount(2)
-New A/C delete pulley
-New dipstick tube and dipstick
-New pcv
-New IAC
-ALL NEW gasket for everything(water pump,intake,steam pipe,TB,etc...)

I probably forget other things but ive changed a lot of things

 

Today i logged the car with datamaster and some weird thing came by:

Those are the number when the idle seems to be fine:
Rpm: between 700 and 800
-Map Kpa: 33.2
-Fuel trim cell: 16
-LT term count: 150 148
-Sterm count: 128 128
-BPW MS: 2.73 2.73
-Inj Dc: 1.7 1.7
-O2 mv: .53 .102
-AFGS: 6.66
-TPS: 0%
-TPS: 0.67 volts
-Spark adv: 26.00degree
-Ia temp : 47.8
-IAC pos: 13

But when i first start it the idle was stuck to 1500rpm.I then stop it and reset the IAC.I start it and it stuck to 1200rpm.I again reset the IAC and the rpm goes back to 750rpm.

I the took some log while driving part throttle in town with a lot of stop and go.I also log a WOT 1-2-3-4 run.The motor takes back 3.5/4 degree of timing in wot but the thing that i found wierd was the idle.

With the motor cold or warm,during all the log test the idle didnt want to drop under 1000rpm at idle.Some times it was a 1000 some times it was at 1300rpm.The only thing that i found on the log was that the tps was at .67volts wich is correct nut it also read 3% open when the tb blade are fully closed.

 

Look at your AFGS. Looks like Satan has gotten ahold of your LT1 there. I hate it when that happens.

 

Here's a TTT for you

 

mine has the same problem, except i think mine is running rich to, or maybe thats the problem. It seems like i have a loss of power not only from dead stop, but in lower rpm's in any gear as well. it has a gas smell to it as well i can smell from outside the car and you can tell when its idling its a little rough and its eating more gas than usual. Whats wierd about my situation is that sometimes it will go back to running perfect sometimes. It is throwing no codes except for 2 that i found in the history, 41 and 86 whatever they mean. I think my problem is electircal but can't figure it out, let me know if you figured out what was wrong with yours.

 

I know i could sound anoying but im unable to find the problem myself.I got 3 datamaster files if someone want to look at them.

My car seems to run pretty lean and the pcm trying to compensate a lot.It also knock all the way thru the rpm.

Thanks

 

My car has always hesitated in temps over 85*F.