My 1995 Ford E150 (approx 180,000 miles) idles rough and demonstrates a 'stutter' at highway speeds.
The rough idle only occurs when in drive (idles fine when in park) and when the engine is at normal operating temperature.
The check engine light is not on (no trouble codes have been produced).
Actions I have taken to date:
1. I have replaced the Exhaust Gas Recirculation (EGR) valve. (OEM Motorcraft part)
2. Verified the specified resistance (in Ohms) of the EGR position sensor
3. Verified the voltage at the EGR vacuum controller.
4. Checked for vacuumed leaks - found none.
I need advice on what else I can check.
Wednesday, January 3rd, 2007 AT 4:12 PM