Ok guys, here is the problem, my car is fine when cold, but once it is warmed up and I give it gas all it wants to do is POP, not pop, POP, very loud by POP I mean it backfires loudly out the exhaust. I have already set the timing. It has no exhaust on it and that is part of why it pops so loud, but I didn't change anything exhaust wise from last year so it shouldn't be that, it ran just fine last year. I am gonna put a new exhaust on once it is running right. I have already replaced the ox sensor, it help it run better but not 100%. I did replace the coil with an accel, so right now I am thinking it may be something to do with the coil being heat saturated, anyone think this could be true? It does run a bit hotter on the upper end do to the no muffler or cat so I think this may be the key. Anyone have simular problems? Thanks for any and all help.

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1987 Firebird Formula
305 LG-4
GM Vortec heads 2.02x1.6 valves
Crane CompuCam 2030
700-R4 Trans
4 barrel quadrajunk remained by holley (this carb stinks!!!)
edelbrock performer intake
Hypertech Thermomaster Chip
Open Element Air Filter
No Cat with Straight pipe (Dynomax muffler rusted apart and fell off probably could not stand the heat )
Accel H/P Coil

- Soon to be installed
383 stroker (built and ready)
NO MORE COMPUTER CRAP
700R4 Lockup kit
Edelbrock TES
True Dual exhaust or 4 inch single pipe to dual 2 1/4"
Stall convertor

[This message has been edited by 87formula (edited June 21, 2001).]

 

anyone ???