!988 ford ranger 2.9 4x4 rough idle cold or warm. Changed plugs and wires checked for vacuum leaks could not find any. Just had transmission rebuilt.

Asked by Nov 02, 2016 at 03:11 PM about the 1988 Ford Ranger STX Extended Cab 4WD SB

Question type: Maintenance & Repair

2 Answers

70,315

Try checking the engine compression. Maybe you have burned valves or other problems from high miles.

140

Check IAC valve. Thats what controls airflow into the engine. Also check fuel pressure.

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