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what gear does it seem to slip in?
ok the high idle is my problem the sliping is not much of a problem i think that is more from just lack of use but it seems to happen at the same time but as of now tranny is shifting good and to answer your Question i have to shift it into L1 to start move its like its stuck in 3rd or OD but idle is stuck at 2700 rpms and after driven for a day or 2 or 3 it comes out of it and idles fine about 750 rpm or a bit less hope you can help tks:)
from the way you explain the problem with the idle and the transmission
the first thing to do here is to remove and clean the iac valve
Cleaning, Inspection, and Measurement Procedure ^ Clean the IAC valve O-ring sealing surface, pintle valve seat and air passage. - Use carburetor cleaner and a parts cleaning brush to remove carbon deposits. Do not use a cleaner that contains methyl ethylketone. This is an extremely strong solvent and not necessary for this type of deposit. - Shiny spots on the pintle are normal and do not indicate misalignment or a bent pintle shaft. - If the air passage has heavy deposits, remove the throttle body for complete cleaning. ^ Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if damaged. ^ In order to install a new IAC valve, measure the distance between the tip of the pintle and the mounting flange. If that measurement is 28 mm (1.1 in.) or less, the valve needs no adjustment. If the measurement is greater than 28 mm (1.1 in.), apply finger pressure and retract the valve. The force required to retract the pintle on a new valve will not damage the valve, shaft, or pintle. Notice: Do not push or pull on the IAC valve pintle on AC valves that have been in service. The force required to move the pintle may damage it. Important: Use an identical replacement part in order to replace a valve. IAC valve pintle shape and diameter are designed for the specific application.
but...from the way you explain...
the problem may be the tps[throttle position sensor]
this is located on the side of the throttle body
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i sorry that i havent time to work on the trooper but i will this weedend but sounds like you are on the right track after then i will rate tks
tht will be fine
it was carbon build up just cleaned it with a brush and some carbcleaner and presstooo tks for your time..