MY TRUCK HAS A MISFIRE LOSES POWER GOING UP HILL...
1993 Nissan Hardbody
March, 31, 2013 AT 9:24 PM
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.
Check and test the throttle position sensor closed and wide open throttle voltages and also the exhaust system for restriction
April, 2, 2013 AT 12:47 AM
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.