I was heading to work one morning and about a mile in to my drive the truck started cutting out. I pulled in at work and it idled fine, but would still cut out when getting in to the gas. It did this the next two times I drove it. First thing I did was checked vacuum. Checked out at around 16-18, so thatís fine, so I moved on to checking missing cylinders. I pulled off plug wires one by one and found out the rear cylinder didnít care if it was plugged in or not. I put on new plug wires and plugs and fired it up. It then had a miss at idle and under power. What the hell. A friend at the shop suggest itís a vacuum leak and I laughed and said it was the first thing I tried. He sprayed break cleaner over the lines and intake and it revved up. Turns out when I was changing the plugs I plucked off a vacuum line from throttle body to the EVAC. Plugged the throttle body with my finger and it ran fine. Cool beans, right? Well after I replaced the hose with new a new line it still has misfires at idle and at speed. I can now pinch off the hose at the throttle body and it doesnít help the truck run right.
Other things I did,
Replaced fuel filter, super dirty gas came out. Almost muddy, filter nearly clogged.
Checked front and rear injectors, both tested 14.7Ohms
Back probed the MAF sensor and it read 1.2V at idle and 2.2V around 3K RPM, also doesnít care if I put my finger in front of the MAF sensor. Unplugging it and plugging it back it doesnít matter either.
The truck isnít throwing any codes out, and I bought a Chiltons manual so Iíd be able to check sensors myself on the truck. But oh no, Chiltons doesnít list any parameters for the sensors, just a how to on replacing them. Thanks, but no thanks Chiltons, I can handle that part.
Any suggestions would be helpful at this point.