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The idle surge problem, where the RPM fluctuates while in neutral, is typically caused by issues with the engine's air-fuel mixture, a malfunctioning idle air control valve, or vacuum leaks. It can also stem from dirty throttle bodies or a failing mass airflow sensor. Diagnosing the exact cause often requires checking for error codes, inspecting vacuum hoses, and cleaning or replacing affected components. Addressing these issues can stabilize the idle and prevent RPM fluctuations.
What else can I help you with?
Why does your 1998 Hyundai accent surge at idle?
I had the same problem and it turned out to be the fuel purge censor
Why does your 2000 Pontiac Grand Am run rough at idle while in gear but runs smoothly if placed in neutral?
Why does my 2000 Pontiac Grand Am, with a 2.4L engine, run rough at idle but runs normally when placed in neutral? I changed the plugs and air filter, but the problem continues.
What would cause a 2000 Toyota Tacoma to surge at idle and while driving?
maybe the clutch
Why does my 1991 Subaru Legacy's RPMs surge from 500-1500 when it started today?
Mine was doing that for a while. I took the Idle Air Control valve apart and cleaned it. Problem solved. Its normal for the engine to idle higher when its cold though. Once it warms up a bit the idle should settle down.
Why would your 95 S-10 2.2 surge up and down while at idle?
check coolant level
What would make a 1992 Honda Prelude SI 2.3 surge while idling in park but idle fine in gear?
Hi I had this problem. make sure your water level in the radiator is full,because there is a sensor kelvin
What causes a car to not idle in gear but not while in park or neutral?
A vacuum leak (Brake booster).
Car is shaking while in idle What is the problem?
plugs or vacuum. 65;
What does a bad IAC cause?
the engine to stall and surge at idle
Why does your Zx2 surge at idle and in gear?
auto or stick shift
Why does your 1992 Buick Roadmaster idle up and down?
most common problem causing a surge while a car idles is the MAF-Mass Air Flow sensor is contaminated. typically this will throw a code (check engine light aka MIL)
If your 1997 GMC 5.7L Vortec has a misfire at idle but not while under throttle whats the problem?
If your 1997 GMC 5.7L Vortec has a misfire at an idle but not while under throttle, the problem is likely the timing. This can be adjusted.
