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Lots of things can cose that what kind of car? What carb are u runing if your runing a holy dule feed ck the fuel lelvel to much are to lil fuel will do this aso ck the curb idel it may be to low ck for vacum leaks as well Depending on the fuel pump your runing. Elect ? Ck that the flow is right for you carb ther are alot of things to look for this is just so commen things as you didnt give details
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What does a bad IAC cause?
the engine to stall and surge at idle
What would cause a 2000 Toyota Tacoma to surge at idle and while driving?
maybe the clutch
On a 94 Honda Civic what will cause it to overheat and cause idle surging?
Your 1994 Honda Civic will overheat when the thermostat is malfunctioning. The overheated engine can experience the idle to surge. The engine should be turned off immediately.
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Check your vacuum lines this usually the cause for a surge in engine speed when idling or running.
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A power surge under a load is probably the transmission slipping. If its a manual transmission the pressure plate is slipping on the disc. If it is an automatic most likely it is a worn clutch pack slipping. If it surges at idle with the tranny in park the surge is usually a defective IAC (Idle Air Control) valve.
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What will cause your 1995 park avenue to surge at high RPM?
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How do I fix my router and computer after an electrical surge?
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What would cause a 1995 Suzuki Sidekick to knock and surge when it is cold but not after it warms up and how do you fix the problem?
i hade the same problem with mine turns out mine was caused by the distributer being faulty. not sure if it is the same with yours but it is worth a try. if that does not work try testing your O2 sensor or idle sensor. . jmm
