Simple brake cleaner will work. We don't want to go flammable :)
You can also turn the oil cap upside down, see if it sticks to the oil fill opening. Spray around the vacuum lines. Spray at the Plenum intake manifold. Just quick shots, nothing sustained. Listen for changes in the RPM's.
Check your rear differential speed sensor. Not expensive, and a simple replacement with a ratchet and a wire harness.
99 1999 Dodge Durango Speedometer Transmitter - Body Electrical - API, ATP, Forecast, Standard Motor Products, Walker - PartsGeek
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