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I have a 2001 Ram 5.9L V8, with 105k miles. It’s running roughly and while attempting to diagnose the problem I noticed that the TPS is showing 11% when no pressure is on the pedal and 73% at WOT. Is the sensor bad, or are the cables just out of adjustment? They don’t seem to have a lot of slack, but when it’s idling, if you lightly push the gas pedal, it will rev up to 1500 rpm momentarily and then fall back to 700 rpm. If you push slightly harder it will do it again, and on the third time it’ll stay at about 1800 rpm.
I know there’s no issue with my device because on my Grand Prix, it shows the throttle positions accurately. That car does have a drive-by-wire throttle though.
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I’m almost positive that the plenum is bad. I have some experience with that. It doesn’t ping under load like my other truck did but it does have audible spark knock at idle in park/neutral. It goes away when put in gear though. My last truck did this too even with new plugs, wires, cap and rotor. It drives nicely but if you maintain a speed with the rpm over 2000 with TCC locked it starts to shake again the way it does at idle. It also feels like it has no power at all above 65 mph or so. I can’t run 75-80 with everyone else on the interstate. I’m probably going to pull the throttle body today and see if I can see any oil in the keg.
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