rhs

My 94 Ranger with a 4 liter engine and AT does not pull my 20 ft travel
trailer well. On hills and at highway speeds the engine-check light will
come on and will start missing and lose power. After a 20 minute rest it
will run good for a few miles then start missing again. It dosen't seem to
heat up at all. First I
replaced the fuel-air sensor, then the fuel filter then the spark plugs
and wires. Nothing helped. When driving around town it is fine, however
the problem seems to be getting worse. Can anyone help me?

nm5k@wt.net

Did you check the computer codes?
Hard to say much without knowing why
the check engine light goes on.
Thats not a very big engine to pull an RV,
but if it's not overheating, I don't see
why the RV would be causing the problem.
Almost sounds like the engine is carboned
up...If it's got carbon around intake valves,
it can keep them from fully closing when the
carbon gets real hot and expands..Might run
some techron or whatever for a while to try
to clean up any carbon..That carbon problem is
real common with toyota's, etc..But I imagine
applies to most all fuel injected cars..
MK