I need some help and don’t know anyone that knows these cars. I have a 94 camaro I just put a new stock short block in and I’m haveing issues with it studdering/hesitating/ misfiring when it’s under light throttle / cruising. Replaced opti/ plugs/ wires/ and o2’s with no change to what’s going on and I don’t know where else to look. Car has lt4 hotcam. 3 angle valve job. 1.6 rr’s with supporting valve train. LT headers. Full 3” exhaust turned down behind the axle. EGR and AIR deleted and tuned out And a mail order tune from moe Bailey done by the previous owner for the list of mods above. Any help would be appreciated thanks

 

I offered suggestions on LT1 stuff in upstate NY in your other thread.

https://www.camaroz28.com/forums/gen...ro-z28-888113/

I'm going to close the other thread, so we don't have two duplicate threads going, people duplicating responses because they are not aware there are two threads, etc.

 

Ty I didn’t mean to post it twice I thought it didn’t post the first time. I’m sorry about that. Thanx again

 

Ok so I have an update. After rokaceing the opti/ plugs and wires and o2 sensors with no luck getting rid of the stumbles /misfire at low throttle. I decided to put the hooker aero chamber muffler back on and the problem got a whole lot better. It still stumbles a little bit but not even close to how it was. Also noticed that t runs perfect when cold and in open loop. Then starts again in closed loop. But like I said now that I put the muffler back on it has gotten a lot better. Why would that be?? Still not fully gone but a lot better. Actually enjoyable now but still wanna figure out the complete fix. Thank you guys

 

Check for a minor exhaust leak ahead of the O2 sensors...they are a bugger on AF ratios

 

O2s are in the collectors of the headers no leaks at manifold thanks for the response. All are welcome