Problem Chevy 8.1 in a 38 ' Kountry Star 2003

[Henderman]

The motor runs flawless for around 200 miles and then it stats to miss fire and loose power until you park and let it cool off. Start it again and run another 200 or so miles same thing.
I have replaced Coils, wires, plug, sensors. Anyone have a clue I am out of options ?

 

[Joe Dutchstar]

Sounds like it may be heat related. You might want to get an inexpensive portable infrared detector.

https://www.amazon.com/Infrared-Thermometers/b?tag=rvf01-20

or for a few more bucks you can get a very useful FLIR device for an iPhone

Flir Edge | Flir

<b>Compatible with the NEW iPhone 15</b><br><br> The Flir Edge (formerly Flir One Edge) is an innovative and rugged thermal imager that allows you to easily inspect hard-to-reach areas from any position or angle. This infrared camera for smart phones connects wirelessly so you can inspect...

www.flir.com

 

[Scooterfan]

The 8.1 Vortec has spark plug wires that run atop the manifold. They get very hot and lose performance. You need to buy these (below) and replace your existing plugs and wires. It should solve your issues. (now let's see if I can find the link )

SPW8100 - UltraPower 8.1L Magnum Spark Plug Wires

Part# SPW8100 - UltraPower 8.1L Magnum Workhorse Spark Plug Wires Description: UltraPower Magnum Spark Plug Wires are patent protected because of the unique method of producing these wires which have extremely low resistance while maintaining very high noise suppression. The benefit of th

www.brazelsrv.com

41-101 - Iridium Spark Plug For 8.1L & 7.4L

41-101 - Iridium Spark Plug For 8.1L & 7.4LSold individually

www.ultrarvproducts.com

 

[Henderman]

The 8.1 Vortec has spark plug wires that run atop the manifold. They get very hot and lose performance. You need to buy these (below) and replace your existing plugs and wires. It should solve your issues. (now let's see if I can find the link )

SPW8100 - UltraPower 8.1L Magnum Spark Plug Wires

Part# SPW8100 - UltraPower 8.1L Magnum Workhorse Spark Plug Wires Description: UltraPower Magnum Spark Plug Wires are patent protected because of the unique method of producing these wires which have extremely low resistance while maintaining very high noise suppression. The benefit of th

www.brazelsrv.com

https://www.ultrarvproducts.com/41-101-Iridium-Spark-Plug-For-8.1l[/UThanks

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[Henderman]

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Thanks

 

[Henderman]

Sounds like it may be heat related. You might want to get an inexpensive portable infrared detector.

https://www.amazon.com/Infrared-Thermometers/b?tag=rvf01-20

or for a few more bucks you can get a very useful FLIR device for an iPhone

Flir Edge | Flir

<b>Compatible with the NEW iPhone 15</b><br><br> The Flir Edge (formerly Flir One Edge) is an innovative and rugged thermal imager that allows you to easily inspect hard-to-reach areas from any position or angle. This infrared camera for smart phones connects wirelessly so you can inspect...

www.flir.com

Thanks