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Rebuilt my TBI and added a fuel pressure adapter right at the inlet. The following thread is of my TBI rebuild... https://www.gmt400.com/threads/454-tbi-rebuild.61579/#post-1315435

https://www.harborfreight.com/basic-fuel-injection-service-kit-64939.html When it comes to TBI the first thing to check is fuel pressure.

Nylog is your friend with AC system. The air gap on a Sanden SD7 is 0.49mm - 0.79mm the clutch nut torque is 124ilb in (~10ft lb)

Curious...are you referring to the AC condenser fan on the front of the condenser or a new fan the previous owner installed? Any pics? I also own a GM P-30 chassis Fleetwood Southwind Storm (1994) 454 TBI w/4L80E trans. I replaced my leaking oil cooler which by the way is part of the AC...

Correct. Looking at the 1994 driveability emissions electrical diagnoses typical value for the TPS closed throttle should be in the range of 0.3 - 0.9v See here: pg 371 http://www.mediafire.com/download/ce2eaxzor28h4bb/1994_NATP-9442_DRIVEABILITY_EMISSIONS_ELECTRICAL_DIAGNOSIS_MANUAL.pdf...

Disconnect the connector on the side of the trans. Do you see red fluid? You shouldn't.

What if the vehicle (RV) has 4.63? I'd imagine in 'stock form' with these older 'class A' RVs this was more common than many knew (not staying in OD). Probably perfectly normal if no other issue is present.

Going downhill in a 10,000lb RV at idle RPM in OD (foot off throttle). Normal. Overdrive in these big RV beasts is somewhat an oxymoron. Even when working perfect they don't spend a lot of time in OD unless the road your on is perfectly flat and no head wind. LOL! At 60mph you should be in the...

You likely have the internal wiring harness leaking into the connector on the side of the transmission. Very common issue with the 4L80E. Crawl underneath and you'll see the electrical connector on the side of the trans. There should be no sign of trans fluid on or inside the connector...

First thing to check with the 4L80E when such an issue arises... The transmission harness connector on the side of the transmission. They are known to crack internally allowing fluid into the connector which in turn will cause all sorts of weird shift/ing issues just as this OPs issue. Other...

If one has worn bushings (not a seal) that is something not related to fluid. Like I said there are a hell of a lot of folks that have switched fluid in a 4L80E and have no issues.

No evidence to suggest DEX VI is harmful to seals. It's been widely used for years with many having no issues. I think I can help you with this. DEXRON-VI was designed to be fully backward compatible with earlier transmissions including the various materials used. This is the difficult part...

Yes and no. Allison Service Tip #1099J states Dexron-VI is restricted to use only in transmissions beginning with serial number 6310670488. This is the only official source I could find. However, ...the S/N breaks for new seals that are DEX6 compatible. They are 6310670488 for Indianapolis and...

It may be old but still applies and may help one down the road. Nothing worse than starting a new thread when dozens or more already exist and can continue to provide useful info.

I know of several shops in California that won't warranty the trans if anything other than DEX VI is used. GM doesn't even recommend or license DEX III anymore.

DEX Vi is proven. Been around for quite sometime now. If a shop rebuilds a 4L80E trans guess what? It gets DEX VI fluid in it.

Been using DEX VI in my 4L80E for years (94 P-30 454 TBI Fleetwood Southwind Storm) with zero issues.

Also check the cooling temp sensor.

Yep, replace the cooling temp sensor first. When it fails it almost always goes full rich mode.

4L80E trans even from 98 is compatible with DEX VI fluid (backwards compatible with DEX III).