P1518 Reduced Engine Power

[03chevytruck]

I have reduced engine power. When i press the gas petal i get no response. I bought a throttle body and the connector that plugs into the throttle body today and i still have reduced engine power. It is throwing a P1518 code. Then it was throwing a P1518 and P1516. Then sometimes it will crank up and it will be normal again! I really need help. I am suspose to be in MS for work tomorrow but i have been fighting this Reduced engine power for a month. It went away for a week or so but then it came back for good. I have checked all by grounds and wires. It all started after i put a new tranny in.... Replaced the battery and it quit for like 2 weeks. But it always comes back! Now i cant get it to clear. If you have any suggestions please help me.
The P1518 is Idle Speed Control...

[GasGuzzler]

You've mentioned the three main causes for this....wires broken inside the insulation 1-4" from the throttle body connector, bad grounds (really check the one on the back of the block behind the passenger side head), and a weak battery. Make sure the battery cable connections are clean and tight as well.

[03chevytruck]

I checked the ground on passenger side and the battery connections are new... I bought them today. I just cant figure this out!!

[RedHeartbeat]

did you check the ground strap from the hood to the cab?

[Show&Go]

I hope you get this fixed in time to come out on Friday and participate!

[farmtruc]

I had a truck do this at the shop, it ended up being the TAC module.

[03chevytruck]

Ok. I will try to use a TAC module off of somebodys silverado to see if that clears it up. Thanks

[GasGuzzler]

That might not work.

[banker099]

That might not work.

haha...thats real optimistic...

[03chevytruck]

That might not work.

Well nothing else has worked either. already 900 dollars in replacing parts.....