Question about Chevrolet Malibu

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77 malibu, 305 cid, HEI, 2 barrel rottenchester, hesitates on acceleration, sucks the gas, if you let up on the gas is catches, also in park you can step on the gas and it wants to die, once is passes that it runs good, replaced wires and spugs, dist cap rotor, rebuilt carb, now I did remove the EGR and it works but it is clogged bad, I can't clean it all out without removing the intake manifold.It's been a long time since I worked on a car this old, CRS.

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  • Ricky Gittins
    Ricky Gittins Nov 08, 2010

    I thought it was the acc. pump also, that's why I rebuilt it, it squirt fine.

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  • Chevrolet Master
  • 4,339 Answers

Hi,

Well, I suggest that you do consider pulling the intake manifold. the plugged passageway serves another purpose: to heat the intake manifold, and that helps the fuel vaporize. This job is ugly, but necessary.clean the passageways in the heads also.

Your main complaint, however, sounds likd an accelerator pump issue. When you press the trhottle, a dual squirt of fuel is to be discharged into the venturi of the carb. This little squirt is to feed fuel until air flow increases and fuel is pulled through the off idle circuit and the main circuits. Typically, you just need to rebuild your carb. A trick is to be certain that the inlet and output check valves are sealing, I usually use the old ball bearing (steel ball) and tap it in it's seat, then discard that bearing and install the new one. Usually the pump fails, but if the checkballs leak, you get fuel on 2nd press and not the first press of the throttle. You need it on each and every press....
Most people dislike rochester because they are complicated, but you can dial out most any problem, as they are so complicated, although the 2 bbl is tons simpler than the quadrajet.

My thought is the accelerator pump circuit...Observe it closely.

Posted on Nov 08, 2010

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