89 Olds Cut/Supr. Idles fine but stumbles and falls on its face @ 2,800 RPM?

Question

The 2.8L engine idles find w/ no missfire at all, spark and fuel pressure test good. TPS sensor V reading @ KOEO throttle closed reads 0.7v and climbs smoothly to 4.7v when opening throttle. Like I said this eng. will idle smooth and remain that way until I bring it up to about 2,800 RPM then it starts Stumbling like it is loading up and if I contenue to try raising the RPM it will fall flat on its face and die. After which it will not re-start unless I push the gas pedel all the way down (WOT).

If anyone has any knowledge of what else I should check or look for it sure would be very helpfull because I'm lost as to where to go from here. Other than take it to a shop.

Thanks in advance,
hyghwayman

Ok , update to the problem. The eng. will idle fine in Park or Drive, it's just when I try to increase the the RPM from 800 it is smooth until it get to about 2,800 RPM. this is the same whether in P or D.

Well I did a few more test and still can't resolve this problem so I guess it will be off to the repair shop tomorrow, unless someone here can point me in the right direction as to what to look for.

Answer 1

whats the fuel pressure at 2,800 rpms? can the pump keep up or is the regulator causing the problem? when the engine dies does it smell flooded?

Answer 2

If the engine speed can be increased without a load on it, but will not cruise at highway speeds, you need to replace your fuel pump, or replace the fuel filter. Or both.

Answer 3

I think it is the fuel pump or something clogged in fuel line.

Answer 4

Could be electrical, check sparkplugs...or fuel related, fuel or air filter or both.

Answer 5

are you driving ,while this occurs? if your setting still and raising the rpm it could be bouncing off the set rev limiter,built into pcm