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I would check coil to plug wiring first. For the OEM coil pack the plug wire order is
Windshield 4 6 5
3 2 1 front of truck
Is it throwing any codes?
Are all of the vacuum lines in the right place and there are no leaks? (Smoke test for leaks)
When it is idling is there an even flow from the exhaust? Just checking to make sure there are no rats nest in the exhaust and the cats are not clogged.
PCV valve clogged? Bad Idle Air Control Valve (usually rough idle but bogs out under load)? Bad MAF or weak coil pack? Fuel Pressure?
Off by one tooth on timing when the head was re-installed. Computer can adjust for idle but not for load. (Grasping here as that only works one way)
There is a lot that can affect idle/no power issues
JAMMAN has pics...
Last edited on Sat Nov 27th, 2021 09:20 am by Tsquare
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Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement