Engine pops during idle - Acer Aspire 9300 Notebook

High idle + exhaust popping ' The Engine Shop ' The Stovebolt Forums

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Jan 24, 2012 - 10 posts It is idling at about 2,000 rpm and there is a popping sound that is most notable at the exhaust pipes. The popping sound isn't all that regular ...

start with a compression test to determine if there is a weak cylinder or imbalance . the stalling could be fuel related... check pressure and change the fuel filter. more info is needed...... lots of vacuum lines and emissions controls, are the all there? is there a vacuum leak somewhere like the intake, pcv, throttle body or plastic tee?

Sorry about the car but don't waist your money trying to fix it just get a new used or new car it will cost you to much to fix

Check engine light has reported that the cpu has found sensoes out of parametyers during the checks. Check fault codes for oxygen sensor, idle speed sensor and air flow sensor.

I would check vaccuum hoses are all connected and unbroken.
Sounds like maybe when it "backfired" it popped a vaccuum line loose.
The way I check for Vaccuum leaks is spray WD-40 the entire length of each hose while it is running, when vaccuum sucks in the WD-40 it will "Rev" the engine some.

The The Air Injection System AIS for that cylinder could be leaking (chrome pipe running up to a fitting right by the exhaust pipe) or more likely the rubber pipe that goes from the engine intake to carburetor is either loose at the engine or carburetor, or the rubber pipe is cracked, split or broken. This would cause air to be sucked into the crack, split or loose fitting during during acceleration or downshifting.

possibly a slight vacum leak?