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intermittent surge/stumble, died driving - no pedal response
2002 F350 7.3L
TS 6 pos programmer/chip
I have had an intermittent surge/stumble for the last 3 years. Maybe once every few weeks would get a surge or stumble. Was much worse with the 10K resistor. Finally a couple weeks ago I threw out the resistor and have been running stock with less pronounced surge/stumble but still does it every few weeks.
Yesterday I installed the TS 6 pos programmer and took it for a test drive. Ran great, no issues. Later in the evening I was meeting a guy to trade some parts.
Took off and about 3 miles from the house, the truck stumbled and the throttle pedal was unresponsive. Check engine line, water in fuel, and wait to start lights all came on. The tach also dropped to zero, even though the motor was still turning. The truck was still running, but the pushing the pedal made no difference. I let it coast to a stop and it eventually died.
Checked the PCM/programmer connection, PCM/wiring harness connection and Valve Cover Harness connections and all seemed ok. I unplugged the ICP and it started right back up.
Thinking I had pinpointed the problem I took off again. Made it about 10 more miles and the truck died again, same symptoms. I was half way there at this point, so I let it sit a few minutes, then started it up and headed on.
For the next 10 miles it died probably 5 or 6 times. The guy had driven 2 hours to meet me, so I wasn't going to leave him hanging.
I finally made it to the rendezvous point and swapped parts. Checked everything on the truck one more time (I left the house with my toolset sitting on the workbench). Started the truck and drove 25 miles home without a hiccup.
The issue was there before the TS programmer, but was never more than a hiccup. The issue happened both on the 100hp program, 75hp program and stock. I will be pulling the programmer and test driving to rule out a bad programmer, or loose connection issue with it. Contacts for the programmer were cleaned and making good connection.
It did rain yesterday and I have read on here that sometimes brings out TPS issues. That was the first real rain we have had for a year, so troubleshooting that one might take some patience.
At this point I am leaning towards a bad throttle pedal position sensor or ICP. The ICP does not have any visible oil in the plug.
Am I headed in the right area? Missing anything obvious?
Anyone around Austin/Dripping Springs with a code reader want to help me out and make some $$ as well?
2002 F350 CC 4x4
7.3L, 6spd, BHAF, 4" MBRP exhaust
TS 6 pos
5" lift, 35's
1991 Chevy Suburban
8" lift, 38.5" SX's