This past week my camaro has been running like s**t. It started with surging after I started the car, which went away as soon as I put the car in gear and applied the gas. Now it takes several starts because it'll surge for a few seconds then stall. Additionally, it will continue to surge even while I'm on the road.

I checked the codes and I'm getting 25 and 35.

Any ideas on what's wrong and how to fix it? I'm afraid I am just starting getting involved with my car. My greatest accomplishments so far has been doing a tune up, replacing the heater control valve and a R-132a retrofit. So any explainations you guys have will have to be dumbed down (plus I didn't bring my Chilton's with me to college).

 

Luder,

Welcome Aboard!

Something's definitely wrong there, bud. At only 223,000 miles, you shouldn't be having any real problems. Heck, it's probably barely broken in (which is not an exaggeration if you've been using synthetic lubricants).

For reference, a "23" is a MAT (Manifold Air Temperature) sensor low temperature fault. That means that the MAT sensor is signalling an impossibly low temperature to the ECM. Generally, that is due to an open circuit or failed (open) sensor. Check the wiring connection at the sensor, read the sensor resistance at a known temperature and compare it to the table:



The "35" on your '91 V-6 is for a fault in the IAC (Idle Air Control) circuit. Again, check the electrical connector at the IAC.

Since it is remotely possible that the problems may be related, check the circuit grounds on the rear of the engine, either on the intake or rear of the head. You may also want to check the ECM grounds.