UK Car Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question
Is the check engine light on and if so, what are the fault code numbers?
How does it idle - smoothly, erratically, or up and down rhythmically?
Possible causes depending upon other symptoms include air intake tube leak, sticking throttle body throat plate, faulty TP sensor or IAC valve, faulty MAF or MAP sensor, vacuum or intake manifold gasket leak
Please remember that I am not there to test and therefore rely on your for as much information as possible
Ok, lets start by checking for vacuum, air intake tube, pcv, or intake manifold gasket leaks. With engine idling out of gear, spray carb cleaner on each vacuum hose, then air intake tube, then pcv valve hose, then around the base of intake manifold one at a time. If idle changes when one is sprayed, that is your culprit
If no difference, then we will go from there
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Toyota mechanic- I have 89 Toyota pick up