I have a 1985 toyota truck when I gas it the engine revs high but truck does not go faster this happens in all gears after shifting or even at a maintained speed trying to pass someone. I changed fuel filter and air filter any other suggestions
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After checking the easy stuff first like low oil level, if it is high RPM(revs) & shifts hard(lurch when it does shift) then I am thinking the transmission filter & oil need to be changed. The transmission filter acts as a suction screen on an automatic transmission & as it collects contaminants to protect the inner workings of the transmission, it becomes plugged which greatly affects the ability to shift especially the high gears at faster acceleration.
If its been without the line for over a year, I Highly doubt it. Look into IAC valve. Most are installed with 2 screws, easy to adjust. Idle Air Control Valve. Look that up, for a start.
Define idles high like its going high rpms before shifting or the engine itself is high reving if its high rpming when shifting its mostly you tranny going out you can try tranny fix oil I used it on my truck when it had shifting problems and ive had no problems since it takes a few days to work though and if its the motor itself it could be a lot of things but I dont know much of the problem based on what you told us
it's nothing to do with speed, you have to shift with engine revs, get used to the engine noise, it will tell you by itself when it wants to shift, to help you when it's sounds straining from high revs that is bad, but don't shift when revs are too low either, usually is between 2.5k or 3k that is the best but cars differ from one another so it's about trial and error.
The problem may be the gas that sat in the carburator. Gas goes bad faster in smaller quantities. Have a look inside to see if you have "gummed" up passages, or jets. Don't forget to change the fuel filter.
Good luck. (I have an 89, and it's a great truck, 300k miles on it.)
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