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Check your engine idol. It could be that your idol speed is set to low. It should probably run at between 800 and 1000 RPM. If it is not then your idol is to low.
The problem is in the idle air control motor. It is mounted on the throttle body with two bolts, you can pull it off and make sure it is not caked with carbon also check where it mounts on the throttle body and make sure it is not caked with carbon.
You need to adjust the timing on the belts. This can be adjusted with a wrench. Adjustments should be made with slight measurements, a hair can change it. After adjustment, turn the car off and restart. Drive for a block and see where the RPM goes to when at idol. Keep adjusting until you get around 700-1,000 RPM. Let me know if this helps.
i'am no expert on this car, but i would chk. the T.P.S. (throutle positioning sensor) there also may be carbon build up on throutle butterfly, not letting it close completely when you take your foot off the pedel.
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.
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