Rough idle when in gear

182,000 MILES
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PSCHAFER
  • MEMBER
  • 5 POSTS
My truck idles fine when in park or neutral, but has a definite miss when in gear and accelerating. Checked vacuum lines (including the one going to the modulator valve on the transmission) and they seem to be fine. Put new plugs (.45 gap) and 8 mm wires, cleaned brush and point on dist, and still doing it. I've gone as far as my little amount of knowledge can take me. Any suggestions would be great.
Jun 21, 2012 at 5:58 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
start with a compression test. back to basics.

if you have a vacuum gauge, check the readings at idle and 2500 rpm.

Roy
Jun 21, 2012 at 6:07 PM
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