running rough

Ive got a 1994 4.0 with the a4ld and ive been having issues with the engine struggling to stay running and destroying the spark plugs. I originally thought that i had a bad head gasket so i replaced the gaskets and had the heads checked by a local machine shop and they said they were fine...

Figured before i dig super deep i may as well list the codes i have and see if any of yall have had similar problems and what your fixes were (also to help people in the future with similar problems rather than just googling it on my own) KOEO (Key On Engine Off): 121 Indicates Throttle...

Recently purchased it, I’ve replaced just about everything I can think of. Plugs, wires, cap and rotor button, map sensor, fpr, ignition coil, is it ion module, fuel filter, cleaned fuel injectors, took cats off and ran it still does it. It’ll run and idle fine for the must part sometimes it...

Had overfilled my engine as a result of a stupid mistake, Pulled the plugs and holy mother were they bad. Replaced the first 4 (8 plug) and got a slight improvement, doing the other 4 today if i can manage to get them loose with the intake still on otherwise waiting for the intake gasket. Along...

i have a '97 Ford Ranger with the big 6-cylinder. It started running rough so I replaced the sparkplugs & wires. It ran good down to the store and then on the way back started missing at around 45 mph. What is wrong with it? The AC was running great & when this happened, it stopped running at...

I have a '88 bronco 2 5 speed, I just installed a 4.0 from a '94 exploder auto. I used the explorer harness but didn't swap dashes. I also used the auto computer if that would help with my question. I also know that it's not the engine itself I took it out of the explorer which ran and drove. So...

Got the engine all hooked up a few days ago and it fired in half a turn but it will not stay running. It starts perfect but when it starts coming down in the rpm's it stalls out every time. I checked fuel pressure, vacuum lines, my coil pack, and the timing was at 8 degrees. I'm running out of...