I drive a 1996 Civic LX with an automatic transmission. 1.6L.

The problem is when in drive or reverse it idles at a constant 2200 RPM

I neutral or park the RPMS go from 200 - 2200 repeatedly.

There is no check engine light on though.

A bit of background, the car always idled very low, and at times felt like it would stall, but never did.

Then I put it into a ditch and had to replace the radiator as a result. Ever since it has been running this way.

Anyone have any ideas?

 

Check that the coolant is properly blead and that all grounds r clean and tight. Has symptoms of a TPS out of alignment as well but I don't think that would be it unless u or the person b4 u has messed with or replaced the TB.

 

iacv possibly needs cleaning

 

I agree.

This procedure may take 20-30 minutes:

1) Park the car on an inclined driveway with the front end higher than the rear.

2) Push the dash heater lever/**** to MAX heat.

3) Follow the directions in the diagram below