I have a 1994 camaro z28, Mods are CC306 Cam, Hooker LT Headers, Cold air intake, 3000 Stall, Pro MAF, 4:10 Gears, LT1 P/P Heads (valve springs, retainers, etc), Eagle Forged Pistons, 1.6 roller rockers, LT1 P/P Intake, Holly 58mm Throttle Body, 30lb SVO Injectors, Adjustable Fuel Pressure Regulator, Sealed Power Hellfire Piston Ring Set R-19100-35 4.030" Bore 1/16"/1/16"/3/16", JEGS Electric Billet Water Pump, NGK spark plugs, MSD Spark plug wires..

The camaro seems to run bad after about 20-30 mins...Seem the longer i drive, the more it wants to run even more bad like it wants to die or something. I was looking at my spark plug wires and seen that it was hitting the headers but didnt seem to burn thought it, So that could do it maybe.. Also i don't have any 02 sensors in the exhaust which i no that's not good, ive been needing to put them in but i just got the motor done and have not have time to get them hooked up. Also i was thinking maybe it could be my opti..

Here's what it's doing, When i first start the car and idle good, but at WOT it seems like it dont want to go, it seems to stall and putt, but when im going about 45 and put it and low gear (AUTO) and the rpm get about 5000 i get on it and it dont seem to do anything at WOT but when im going about 25 or any mph and go WOT and don't go. Also when im driving about 25 mins or so it seems to idle really bad and not want to run right at all..

Well any help would be great, If there is anything you need to no, feel free to ask, Thanks everyone..

 

See this all the time. Car running bad and it isn't finished. You need to finish it and then chase down issues. Does the car have a tune for all the mods? Whats all been done to the car since it last ran good, as in recent modifications?

 

Without the O2 sensors, the PCM is prevented from "learning" what it needs to know about the A/F ratio correction. As good as the tune may (or may not) be, your preventing the PCM from optimizing it.

As noted above, finish the work and then see how it runs.

When I see things like a "Pro MAF" and an "Adjustable Fuel Pressure Regulator" it makes me suspicious of the entire setup. What pressure do you have the AFPR set at? Did you tell that to the tuner? Would it just happen to be an Aeromotive AFPR?

 

https://www.camaroz28.com/forums/lt1...pro-maf-99307/

Here is info on your maf. I would go back to stock if you have one. I even bought a new GM one because of all the bad things I heard and left it with the honey comb screen.

https://www.camaroz28.com/forums/lt1...ulator-657589/

This is probably one of the top things that go bad and most end up removing and I always recommend removing it and going back to stock. There is no benefit on your setup to have one and the failure rate is very high. You need a very heavily modified engine to ever need one.

You never mention a tune and it will be necessary to make the car run right. You have to big an investment to risk ruining it by driving and even running it in the current state. I always recommend AC Delco O2 sensors and a GM opti and expect problems if you buy cheap aftermarket parts.

 

You can't expect it to run correctly without the O2s. Tie up all your loose ends and heed the advice so far in this thread, then see what you've got.