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My car is not shifting right. It only shifts at the redline. This goes for all gears. it shifts from 1st at 45 mph as the engine hits the redline, and it shifts from 2nd at 85 mph as the engine hits the redline. basically it acts as if the throttle is constantly wide open, even though it isnt.

Also, sometimes when i rev up the engine in Neutral or Park, it makes some odd noise. sometimes it does it, and sometimes it doesn't do it.

now, the night before this started happening, i did a power wash on my engine. when i was done and drove off, nothing was amiss while i was driving.

My theory: Either the throttle position sensor or the vacuum sensor has gone bad, because i've heard that the ECU uses these sensors to determine when to the the tranny to shift.

My car is a 1989 Oldsmobile Cutlass Ciera 4 door SL. The engine is a 3.3L v6 engine with multiport fuel injection. The transmission is the 4T60 4 speed automatic transmission. the car has 175,000 miles on it.
 

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my theory....Its 20 years old and telling you something......

Sorry really Im no help but it is an old car, time for an upgrade....
 
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