I have a 1994 Ford Ranger 4.0 L 4x4 5-speed.
The truck runs fine when first started up but when it starts to warm up the rpms start to fluctuate and it makes it almost impossible to drive because it’s really jerky and if I let off the gas it wants to die on me.
So I replaced the coil pack and new plug wires thinking they where just old and getting hot but that didn’t fix my problem. I also had to replace my exhaust because it backfired and blew my muffler up so I had to straight pipe it.
Any ideas? Please help. The check engine light comes and goes (mostly stays off though).