1994 Bonneville SE

Several months ago the engine would surge upwards of 3000 RPM on startup and stay there. I pressed the accelerator several times to see if maybe it was stuck, but surge continued. Turned engine off, cleaned the throttle body with carb cleaner and seemed to fix the problem.

Yesterday, drove home from work. Stopped off at a store and returned to the car. Started it up and it surged to ~3000 RPM and did not drop. Managed to drive it the 1 mile home while holding the brakes.

Got home, turned the engine off then on again and no surge.
Any ideas? Another throttle body cleaning? TPS?

you can first make sure the throttle plate closes properly.

really should get it scanned for codes and make sure tps is proper

is the ses light on?

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

SES light is not on.

Replace IAC sensor or MAF. If i had to guess it's going to be the Idle air control

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1994 Bonneville SE - Series one. L27
1998 Bonneville SE - Series Two. L36
2001 Bonneville SSEI - Series Two. L67

try cleaning it first _ may get lucky

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am