Hey guys, please give me a hand if you can. I'm not familiar with Camaros, so bear with me. My brother has a 92 RS with the 302 TBI engine. He's not too mechanical, and called me in to help him out.
When starting, the engine fires right away. Revs up to 1500 and them goes to settle to idle. Right there (engine has only been running for 2 or 3 seconds at this point), it starts to "chug", almost like only half the engine is running. If I press the accelerator, half the time it just dies out, the rest of the time the RPMs will go up, but very slowly and roughly, still chugging. The exhaust stinks like it's running rich, and thanks to a fresh snow, I can see that black soot is coming out.
Looking at the engine, all the obvious things are right. No obvious vacuum leaks; all connectors are tight; wires, cap and rotor are not brand new, but still servicable looking.
This problem came up suddenly- one day it worked, next day it didn't. What's got me confused is that the engine runs OK for those few seconds. I'm guessing that some sensor or something has taken a crap, that the computer doesn't pay attention too for the first few seconds. But maybe I'm going down the wrong path...?