rough idle

[jwkoehn]

96 350 gm carbed
idles like it is running on 7 cyl beyond idle runs great. great power out of hole has no trouble pushing 5000 lb at 40 mph new plugs cap &rotor i suspect a bad plug wire. on a previous repair a wrench was dropped on the hot alternator wire causing a few sparks but continues to work except the volt gauge now jumps around at low rpms . Is it possible I fried a diode in the regulator causing unstable voltage at idle in turn simulating a miss ? thanks Jim

 

[jwkoehn]

Re: rough idle

did a comp check 1 dead cyl #2 . burnt intake valve did a valve job ran perfect for an hour. started to run rough again checked comp again 2 burnt intake valves, blue in color temp gauge 140-160. gauge said it never ran hot.. intake again on # 3&4.tuliped. cylinders look good. comp on rest of motor at 175-180 need help to figure out what is going on here Also this is a bravo 3 96 vintage gm 350 turned into a 383 stroker 4 bbl carbed thanks for any help Jim

 

[jwkoehn]

Re: rough idle

also the problems started after I had the fresh water pump replaced

 

[John_S]

Re: rough idle

Running lean, too much compression, too much timing advance, poor fuel, detonation, over propped...