1994 Ford Ranger very bad idle problem

[dukeman2251]

i am currently having the same problem with my 91 2.3 idling up and down whenever it wants. i originally thought it was a vacuum leak because i got around 14 psi at idle but i cannnot find any leaks. i have no idea what it could be now

 

[chilsam]

coolent temp sensor

my 87 did the same thing turned out it was the coolent sensor for the ecu in the intake manifold.

 

[dukeman2251]

have you put a vacuum gauge on it?

 

[jlove1974]

could be unrelated problems. If it's not your state of tune, your IAC, or your DPFE sensor....then timing belt stretch has been a problem for my 94 B2300....but I have the california model with the CPS on the dist. shaft stub so....mine is very picky!