While driving at any speed my speedometer drops to zero and the goes back to normal by its self or i have to make a complete stop for it to read right??? while speedometer drops to zero rpm is increasing, engine sounds louder (wants to go but acts like its not shifting or something, then when it goes to the right mph it like jolts forward like im shifting gears or something
You have a serious problem that needs to be check out buy a tranmission shop be for it ouits on you completely.
SOURCE: 1999 ford tauras transmission and speedometer
Replace the speed sensor on the trans that will cause exactly what you describe is happening.
SOURCE: 1994 ford ranger extended cab 6 cyl fuel injected 2 wheel drive automatic
This year of ranger had a few flaws, In one case, a break power booster was robbing the vacumm, you can test this by plugging it off and seeing the differance, but you will have limited brakes. This model year had a problem with a vacuum leak on the manifold. You can check these in many ways, but please don't use starting fluid. The rear of the manifold usually on the drivers side where it seals to the block.
Also, in 2 other cases a cracked head has gave me the same problem. It is caused from a loss of vacuum.
SOURCE: 1997 Suburban 4x4 5.7L Transmission whines until it shifts
You rear planetary set is worn from a restricted cooler.
SOURCE: RPM drops to zero at idling after engine accelerates when warm
This may been an ignition module or a MAF sensor, this car may need to be diagnosed using a OBD I computer code reader to accurately diagnose the problem.
SOURCE: 1997 Saturn SC2 5-speed idling/revving oddly
there are a couple of things to look at. first take a look at the tempature controll sensor, its on the right side of the block. It kinda looks like a spark plug sticking out the side of the block. If its cracked or broken then it will mess with your idle. Also you should be checking your throtle body control censor and your throtle body. clean everything out. also the BWD Ignition Module/Control Unit. If its cracked it will cause this exact problem. I would also add a general tune up with spark plugs and wires. If you follow these directions I think you will be good, if this does not work let me know, I can give more info once I have a better idea.
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