'83 5.0 w 4180 carb won't idle keeps winding up to about 2000+ RPMs. Last night, car was running and idling fine, downshifted to 4th on entering highway opened it up a bit then shifted to overdrive, all fine didn't notice anything. Exiting highway 10 miles later engine wanted to rev up to 2000+ RPMs. Timed most of the lights right and made it home but can't get rid of or figure out why the high idle? Checked this morning everything looks normal but still goes straight to high RPMs. Car does have A/C but is not working and is off.
A little history, car had been sitting for several years before i bought it Oct. '17. Since October I have driven it very little less than 200 miles mostly just to locate the next problem. Seller claims carb was rebuilt shortly before sale. First thing I replaced was a leaking crossover tube and attached thermactor valve. Next was front end rebuild, ball joints, struts, replaced floppy tilt steering column. Then new radiator all hoses and 160*thermostat. Lastly, just 2 weeks ago, removed howling 3.08 7.5 replaced with 2.73 8.5.
Have been test driving for right at 200 miles getting 15 MPG city highway mix, after 20% adjutment. Car was running great! Was planning on starting on the interior. Now this!
Engine has all smog equipment however not sure if all is funtioning properly.
Have to head out now but will check back in a few hours, Any ideas on where to begin will be appreciated.
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