1990 accord ?? newbie !!

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lbsnoopy

New Member
when in park my idle starts reving up and down , doesnt do it all the time , what is causing this ? idle sensor ? HELP ...:confused:
 
could be a bunch of things. i assume it's not throwing a CEL?

check for air in coolant (may need to be bled)
 
Check the coolant. Also check ur IAC valve located on the back of the intake. These are know to clog up and cause this problem....i have to clean my bros in in civic tomorrow haha.
 
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