Hello Everyone,

I purchased an '86 Ranger that has a '93 Mustang engine in it, both engines were 2.3L's. Seemed kind of like a pointless swap to me, but I really have not dealt with Ford's too much to know and I only paid $250 for it. The engine is a 2.3L FI SOHC.

The engine runs exceptional, only problem is that it stalls frequently when cold. Ever since I got it, it would seem to stall at random intervals when coming to a stop sign or just sitting there idling (It is a 5 spd manual).

Recently I did a tune-up on it... Plugs, wires, cap, rotor & air filter... Now when you start it in the morning it will stall immediately. Once it heats up, it will idle fine, but otherwise it will stall constantly if you do not keep your foot on the gas a little. It also still does stall randomly when coming to a stop, or backing out of the gas quickly.

There was no air filter in it before... There is also some hesitation like when shifting from 1st to 2nd during normal driving. I am wondering if it might be a fuel regulator problem, perhaps dirty sensors in the intake/throttle body, something else or a combination of things. Any and all information would be greatly appreciated. Thank you for your time!

- Philip