1993 Nissan Hardbody Truck Misfire Loses Power Hill Bogs Down Almost Shuts Off

1993 NISSAN HARDBODY
147,000 MILES
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SNOMAN3389
  • MEMBER
  • 2 POSTS
My truck has a misfire, loses power going up hill and bogs down to almost shuts off when I push the accelerator to the floor. I have changed the mass air flow sensor, O2 sensor, spark plugs and wires. I don't know what else it could be.
Mar 31, 2013 at 9:24 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check and test the throttle position sensor closed and wide open throttle voltages and also the exhaust system for restriction
Mar 31, 2013 at 9:27 PM
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SNOMAN3389
  • MEMBER
  • 2 POSTS
I changed the throttle position sensor today and the exhause is clear except for a leak at a flange. Nothing changed, except I noticed that my air intake box where my air filter is has a high pitch whistling sound when the engine is revved. I'm at a loss.
Apr 2, 2013 at 12:47 AM
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