Ok heres the story 350 79. 600 holly DP, 465 lift cam bored 30 over, new everything from this to that. This car keeps banging out under hard acc.. what can cause this by banging I mean popping spitting sputtering if you can think of it It happens Please help...........

 

Is your timing adjusted properly.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

Could it possible be fuel starvation? My car has a problem every now and then - on WOT for a long time, the fuel bowl completely empties and the car lurches up and down. I have to elt off the gas almost compeltely, give it a sec or two for the fuel bowl to fill back up. This only happens to me if my engine runs hot and if i hold WOT from like 40 to 80. The first time it did it I thought it was detonation. That could also be your problem, though. What octane gas are you running?

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1983 Firebird
TH700R4 Auto
Small Block 400
LG4 ECM, Intake, Carb, Distributor, etc.
Soon to be non-computer.
Clarion Head Unit 45X4
2 Pioneer 400W 12" Subs
Third Gen Performance
"A four cylinder is half an engine."
"Ponies can run, but birds can fly..."

 

Its a carb problem.
What are the condidtion of the spark plugs? wet, dry, white, black?
Sputtering can be too much fuel or too little, the plugs should tell the tale.
SSC

 

Check your plug wires also. This has happened to me where they got cracked from laying on the headers.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite