1990 Mazda B2600 Questions

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my truck idles high when it is cold when the engine gets hot it still idles high, it stays around 2500 rpm's with your foot off the accelerator.
I poured head gasket sealant in the the radiator now its making a loud tapping noise.
automatic will not shift properly when hold light is on
I have a mazda truck b2600i starts and run good but if you try to speedup it has no power
Wiring harness, wiring harness is getting power, i plug them in, fuel pump doesn't work
Hard to find computer for this year, only get one for $250 should I purchase has anyone had luck with these?
all connections look good tore apart ecm and found bad spots on board inside. Believe i need an ecm anybody have one for a 1990 B2600i for sale let me know please jdguy
i can spray starting fluid and it will start and run. turn the truck off and it will not start on its own. you will have to start it with fluid again.55 lbs fuel pressure.have spark.............
After alarm was install my brake and anti lock lights stay on. But the weird thing is that when u press the clutch switch in they go off
my headlights (low beams)do not work if i pull on the highlight control it does come on i cant do this while i drive please tell me how do i replace my headlight switch
my truck is leaking coolant from under the intake manifold in not shure if it is a head gasket or oil coolant line or heater core return line what is the easyiest way to determine where the leak is coming from this ...