TPS wears in spots and can cause intermittent problems like you described. Try turning off the car and unpluging the TPS. Start the car and see if smooths out the idle/reving problem while the TPS is unplugged. If yes replace the TPS.
SOURCE: won't shift out of low,speedometer doesn't work
see my comments, not 100% sure that it was the out put speed censor or not, but after reconnecting the wires to a new censor and reconnecting the battery and clearing codes it worked. connection was not clipped may have been loose
SOURCE: 1999 Dodge Gr. Caravan downshifts in D. Works fine in D3
Perhaps I'm crazy, but when I ran a shop, the vehicle did not go home 'till the problem was solved and I never charged for items that did not fix the vehicle...( I had the silly idea that the customer should not pay for my mistakes .therefore in my world they already have abdicated.)
The problem may be beyond the skill level of anyone in the shop...therefore doing the same thing over and over will give you the same results. You need a fresh "eye" on the situation. Only then will you get a different result. There are "flight tests" and other diagnostics that can be done that should give you an idea what is going on.
If the repair is going to cost more than what the vehicles value is, then it's your decision about what to do. You can have the repair done, buy a different car and/or you may have some legal means of recovering all or part of what you spent not fixing the problem.These are decisions you need to make, but decide after you have the facts in front of you.
SOURCE: code 23 engine idles but surges when in gear
Replace the Intake Air Temperature Sensor.
Depending on your size Engine (2.4L, 3.0L or 3.3L) It should be located where the Air Filter is. When you take the cover off, it wil be mounted into the cover. It has the only wires going to the cover.
This sends information to the Computer which adjust the air/fuel mixture - causing surges.
The 2nd recommednation: to remove, clean and check is the Idle Air Control (IAC) Valve and replace if necessary.
Let me know if this helped....
SOURCE: Had the check Engine Light Code TPS Po123 High
have you cleaned out and tested the throttle and body itself? Tested any relays if there are any on this one?
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if iac is unplugged when engine is running,it dies wether it is cold or at operating temp
I cleaned IAC valve and it seems to have helped but I'll have to drive it for awhile and see if it starts revving intermittently again.
ya that fixed it
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