Friends sister has a 99 blazer with 4.3. No check engine light. i hooked up my laptop, all sensors are sending signals (didnt know values one everything, but seems like they were changing atleast somewhat)

Truck has fairly recent plugs/wires/dist cap/rotor/ maf


At idle seems to have a little bit of a shake to it, normally i'd say misfire.

Revving in park, it seems fine

Flooring it, it slowly accelerates til about 3k rpm, sits there for a while, shifts, stumbles, etc

Tops out at about 55. Manually shifting, it'll hit about 3k rpm and just sit there until shifting.

Buddy thought it was EGR, unplugged it, car got a little better. Not much, but revs up smoother, and will go about 70

I unplugged the TPS and nothing seemed to change, i would GUESS it's bad. But wouldn't that throw a code? She just bought a MAF cuz someone told her that was the problem, don't want to just throw parts at it. I'm not sure why unplugging the egr made it slightly better. If egr was bad, that should have fixed it completely correct? If it egr was good, unplugging shouldn't have changed anything.