explosions on my 318..

danval said
Ok, so im on the gas on my dart, 318/904.
Once i let the gas pedal go it starts throwing explosions down the headers, and the faster i go or the more gas i give, as soon as i let it go, the bigger the explosions are!!! :/
And it wont do it in neutral....
Is it timing or fuel mix? of both? thanks guys!
Click to expand...

Vacuum leak maybe? When you let off on the gas vacuum rises way up until it goes back to idle. Try hooking a vacuum gauge up to the intake and check it at various throttle openings including full throttle. Could be a gasket.