Ok. Here is the deal. 94 toyota pick-up, 22RE 4CYL. When truck is cold, engine will start and run fine. When the engine starts building up to operating temp, the engine starts bogging down, like its building up pressure. I'm not really to sure where to start looking or how to figure out whats going on. I havent ever even heard of a vehicle doing this before.
Any input will be greatly appreciated. I really want to get my truck back on the road.
Thank you.

 

I would start looking at the cat

 

Good advice right there. A semi plugged cat will get worse as it warms up or so I've read. You might also look at the PCV valve as it vents pressure from the crankcase and as the engine gets warm it builds pressure.

Again this is all from what I've read here with no experience to back it up. I do hope it helps though.

 

Same issue here;

Couldn't trouble shoot, however, until I replaced radiator(was overheating quickly). Now, running cool, but no engine light....yet, ....it's still bogging upon warm up(rpm drops to 3-400 and runs a bit rough). Runs smoother since fixing cooling problem, but still; 1. When starting out in 1st(and any gear onward), it has limited power.....until around 3,200rpm, then....'BAT OUT OF HELL'.(Clutch is strong) 2. Had my buddy run codes at his shop, but it was overheating, so had to fix, first. He said it threw an O2 sensor code and a TPS code. 3. However, upon fixing cooling problem, even through it's running rough, I'm getting no engine light(so I'm guessing it's not throwing any codes?)

Wondering if there's a checklist that anyone can recommend?

Thanks for your time,

Chef Mark