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1996 Chevy Truck miss and service engine light

Tiny
MADMICHIAL
  • MEMBER
  • 1996 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
At highway speed (65-75) I have miss and if I drop from overdrive to 3rd it gets worse and jerks. The service light comes on and blinks. The code given is p0300.
I have changed plugs, wires, cap, rotor and o2sensors
I tested fuel pressure it is good and stays constant. TPS voltage is smooth climb w/no dead spots


This is my second time asking this question on the site, The first time I got no help so this time I cant donate much. Sorry
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Monday, November 24th, 2008 AT 3:44 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Code is multiple/random missfire this is a tough one to diagnose via internet. What have found out in past is a fuel problem ie. Low pressure, clogged filter or injectors. Start with fuel pressure and give ignition a look. If all checks out then a faulty crankshaft sensor or camshaft sensor will cause P0300.
Let me know
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Monday, November 24th, 2008 AT 3:52 PM
Tiny
MADMICHIAL
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  • 7 POSTS
Can these sensors be tested?
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Monday, November 24th, 2008 AT 4:25 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
With a diagonistic scanner. You can use a DVOM on AC volt scale and see if a signal is produced. Not as reliable as the scanner.
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Monday, November 24th, 2008 AT 4:51 PM

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