How Can I Correct A Weird Idling Problem?

I bought an older 1987 Ranger (clean truck with very low miles) with the 2.3 L engine. Here’s the problem: When you first start it the engine idles and drives smoothly. But when you turn off the engine after awhile (like a trip to the market) and start the engine again it idles really ragged. I checked for vacuum leaks and found none, replaced the EGR valve and oxygen sensor as suggested and still the same thing. It idles fine when the engine is colder but runs ragged when starting it after it’s warmed up. Any suggestions?

Anonymous2014-04-02T05:03:48Z

Have you checked out the idle regulator? I have had similar problem - it was hard to start warm engine on my car and after some while the same happened to cold engine to. One day it didn't start at all and the next day it started from half a spin. Idle regulator was at the fault...