dreaded reduesed engine power

[outdoorguy1979]

so I have 2003 Tahoe with a 4.8 v8, with mileages unknown. when I bought this Tahoe a year in a half ago the cluster did not work. anyway replaced the cluster and everything works now, so down to the issue I have. for a year now ive been having trouble with reduced engine power, I have to pull over and start and restart the engine a few times or unplug the the throttle body for a few minutes. so with in a year
have replaced in this order
the throttle body
the pig tail to the throttle body
and I have replaced the gas pedal sensor
and the tac module it was used
everything but the tac module was new so I'm still getting reduced engine power.
tonight I have pulled oh each wire to the the throttle body and gas pedal
I have checked the grounds on the back of the engine, under the driver side door and put a new battery in it about 6 months ago.
I am about to pull my hair out and I do not want to have to pay chevy 100.00 for them to put in on there machine. so has anyone had this problem and how did you fix it?

 

[Scottydoggs]

ever scan it for codes?

 

[outdoorguy1979]

ever scan it for codes?

yes p1516 ive got the codes for the throttle body and the gas pedel, I was told the throttle body does not often go bad but the gas pedal does

 

[Tonyrodz]

Sub'd. I also occasionally get this issue. I also changed pigtail and replaced entire throttle body. When it comes on, I either shut down and restart, pop hood and wiggle the tb plug, or while it's off, pump the gas pedal 3 times then it's all good.

 

[outdoorguy1979]

but I get it a lot

 

[outdoorguy1979]

ok update I think I fixed it I took it to chevy dealership and paid 107.00 to have it diagnosed, and they said it was in the wiring between the gas pedal and tac module. I removed the wiring harness and ohmed the harness. I replaced 2 wires with a heaver wire and seems to have fixed it

 

[Tonyrodz]

ok update I think I fixed it I took it to chevy dealership and paid 107.00 to have it diagnosed, and they said it was in the wiring between the gas pedal and tac module. I removed the wiring harness and ohmed the harness. I replaced 2 wires with a heaver wire and seems to have fixed it

I wonder if this is a common issue to the nbs, just like the pigtail going to the tb is. Have a pic of the affected/problem harness?