I got a 1993 chevy RV with 454 TBI and 4L80E trany. Once in a while on slight uphill the tach goes from a normal 2500 rpm up to 3000 rpm, but the engine rpm remains at 2500 because its in TCC lockup and it starts to lose power. If
I press on the gas the tach goes back to normal but engine continues losing power until I pull over shut off engine wait a minute restart and all OK again. All sensors and fuel pressure check OK . Seems like the PCM or ign module is getting some sort of electrical interferance. I'm stumped.

 

sounds like the tcc isnt kicking out when you accelerate like it should

 

I have a switch that keeps it locked up.

 

is that a question or a comment

but yeah there are a few things that control the tcc
and might be aplug on the tranny to unplug and see if ur problem goes away

 

It's a complex custom switch that satisfies the PCM.

 

Could it be a sensor wire not making connection with the sensor and thereby acting like an antenna picking up stray signals? The ignition puts out some strong pulses.

 

maybe that complex switch has gone bad