Still could be the pump, start and idle uses a small amount of fuel, the higher the rpms the more fuel it uses, if the pump is putting out low pressure or volume it could cause it to run bad at higher RPMs when it needs more fuel. The power probe won't actually actuate it, they use a pulsed signal that rotates the armature in the valve and the position sensor counts a step and stops, if it gets say 6 pulses of one polarity it rotates 6 steps, then it could get 6 in reverse polarity and it moves 6 steps the opposite way. That is why you need a scan tool for that.
If you were driving it and this started, was it an instant problem, like it started shaking and flashing check engine light or was it a gradual thing where it started getting worse over a few miles at speed?
Checking for a vacuum leak isn't hard, use a can of carburetor cleaner to spray around the manifold and lines. Block off the line to the brake booster as well. If you find nothing, then I would test the pump.
Check both pressure and flow rate. You need 52-59 PSI key on engine off. Flow should be about a quart in 15 seconds.
Monday, March 28th, 2022 AT 12:47 AM