my exhaust was popping and the car was running like total crap, i replaced the cap and coil and the exhaust no longer pops and it runs a lot better, problem is it still makes a poof poof sound under the hood every once and a while when i hit the 4bbl, what would cause it? it doesnt do it every time i hit the 4bbl, but it does it often, it's a rochester computerized with a performer manifold.


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86 Camaro with 88 305 LB9 using 86 carb setup, edelbrock performer manifold, 305 S/R Torquer Heads, Hedman Headers, Crane Compucam 2032 edelbrock cat-back, gutted cat, slp underdrive pulley, mallory ignition, 305 h.o dual snorkel air cleaner, hypertech thermomaster chip,160 degree thermostat, 5-speed, 3.23 posi

95 Beretta Z26, 3100 V6, 4 Speed auto, stock

 

update, it makes the poof sound with or without the 4bbl like it's backfiring or something.

[This message has been edited by 86Z (edited July 23, 2001).]

 

Any problems when you turn the car off?
Im thinking if it was a vac leak it would be more of a POP instead of poof.
Turn the timing down a few degres and see if it helps.
SSC