bad stutter at 2000 rpm, only power key on

[tccrab]

Typically, bad fuel injectors cause symptoms such as a missfire at idle, rough running at a constant RPM and a loss of power when the secondaries are opened. It all depends on which injector(s) go bad.

When a fuel injector's internal coil goes shorted, it usually causes the injector to stick in one position. That position could be wide open fuel, partial fuel, or no fuel at all.

A bad primary injector will cause misfire at lower RPMS that goes away when the secondaries open.

Secondary fuel injector(s) failure will cause a loss of power which usually manifests itself when you can't feel much a difference between Full Power mode and Low Power mode on the Valet Switch.

Your situation as you describe it, sounds like the engine goes either rich or lean during the transition time between High Power mode and Low Power mode, which clears up as engine RPM increases.

TomC
"Crabs"