8 ford ranger 4.0 v6 Truck idles rough

1998 FORD RANGER
130,000 MILES
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BADMECHANIC2
  • MEMBER
  • 3 POSTS
4.0 v6 hesitates and surges when accelerating and rough idle. Hsa new plugs, wires, camshaft sensor, crankshaft sensor, ignition coil, egr valve. mechanic did fuel pressure test and vacuum test and its o.k. No light and when it had aq light code was po 309.
Apr 15, 2012 at 2:04 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
i would start with a compression test first. i would also smoke the intake system looking for vacuum leaks that would do this.

Roy
Apr 15, 2012 at 2:05 PM
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