Hi all,
I have a 93 LT1 camaro with 144,000 miles. When you try to lightly after its warmed up it stumbles and sounds like it is loading up or something. When you try to cruise at 60 then slowly start to give it gas it sounds like it stumbles some too. And once warmed up, it sounds like it is missing at idle on 1 cylinder or something. But you can step on it from a stop and it sounds and runs fine. I dont get what the deal is. If you need the power its there, but you can't slowly accelerate at all once its warmed up. It has a 54mm throttle body, k&N air filter, new ac delco plugs, wires, and a new distributor with msd cap and rotor. I also replaced the coil with a msd streetfire. Please Help!!!!!!!!

 

Might be a TPS issue. Use a scanner or meter to diagnose.

 

Sounds a lot like the issue im having with my 93...yay

 

Sounds like a cracked plug to me.

 

Agree with Shoe...sounds like it could be a tps issue.

 

same problem w/ my 93!

 

Key on, engine off, put a volt meter on the TPS sensor (signal wire to ground wire) and check the closed throttle reading (should be in the range of 0.20 - 0.90V; some people prefer to see 0.50-0.67), the WOT reading (should be about 4V higher than the closed throttle reading). Then starting from a closed throttle, slowly open the blades watching the voltage. Should transition smoothly from closed reading to WOT reading, with no spikes or dropouts.

The other sensor that can cause issues on the speed-density 93 it the MAP sensor. The ECM uses that as a measure of engine load, and uses the reading to calculate the mass air flow rate, so it knows how much fuel to add. Put a volt meter across the signal and ground wire (both these sensors are 3-wire circuits, with a 5V reference, a ground and a signal wire). What you see at idle will be a function of your cam and your elevation above sea level. Look at the "MAP" section of this writeup:

http://www.injuneer.com/ScanMast.html