Ive had a rough-idle/stall issue with my pickup (91 Chev K1500, 4.3, AT). Thought it was a vacuum leak. Replaced IAC valce, dist cap (badly corroded), rotor, plugs, wires. I also just replaced the EGR valve because when I sprayed carb cleaner near it, the engine revved. Since replacing the EGR valve, I experienced intermitten hard pedal. Could it be that my brake booster was the source of the vacuum leak? Why would it be affected by changing the EGR valve? Just coincidence?l
As a side note, Ive not ruled out intake gaskets yet. I am also replacing the throttle body gasket.
As a side note, Ive not ruled out intake gaskets yet. I am also replacing the throttle body gasket.
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