Hello to everyone. Sorry if this is long.
This is my first post, but I've been monitoring similar threads for the past week or so. Recently I've got my ranger up and going after about sitting for 2.5 years. The transmission went bad and it took awhile to pay for all the parts and since my labor is cheap and I work full time, I was slow in rebuilding the tranny. Anyway, the ranger is having some issues. When I start it after sitting a night, it starts fine but then sputters and dies unless I give it some gas. After giving it a little gas it warms up fine. When I drive it, say around 30MPH and in 3rd or 4th gear the engine sputters like it is missing and lunges. It will do it in most gears, but seems worse in a higher gear at a low speed. Cruising at 60mph in 5 gear is not that noticable. I'm stumped!
I have replaced the fuel regulator (it was sucking fuel into the vacuum line) and having trouble starting after running for awhile, I also replaced the fuel filter, spark plugs, distributor cap, wires, and air cleaner. I also cleaned the throttle body, idle air controller and flushed the cooling system (Winter tuneup). I just rented a fuel pressure gauge from Autozone and was planning to test the pump this weekend. Somebody mentioned that there is a check valve on the pump assembly in the tank that can go bad. Would this check valve cause the problems listed above?
Any suggestions? Is there anyway to test the throttle position sensor?
1989 Ranger STX SuperCab 4x4, 2.9L, FM146 Transmission, Automatic Lockouts, Cat back Dynomax exhaust