lesh6

Thanks All, Inputs are welcome. Cause I have run out of ideas Spark Plug wires are brand new. Forgot to mention that.... I have an XiTech XR-90 OBD II Scan Tool. No codes are in there.... Does not seem to matter dry/wet cold/hot.....Reset ECU and it runs fine for 15 minutes.

I will check the Knock Sensor but even the old "looks" ok. No cracks that I can see..... I agree with Air / Fuel ratios but no idea how to check and am real tired of simply throwing parts at the car. I can say that I feel I have reached the point of no return, tool late to scrap the car. BTW, the ECU does not throw ANY codes.....

Hi Everyone, This is my first EVER post on a Forum. I hope it is in the correct place. I have a 1999 Subaru Legacy L 2.2 with Hesitation and Low Power issues until 3000rpm. So let me give the story and ask for advice. Unfortunately, it has been to multiple mechanics and I have worked a lot on this car.....Even been to a Subaru Dealer..... New Parts: Knock Sensor Front O2 Sensor Mass air flow Sensor - OEM from Salvage Yard Fuel Filter Fuel Injectors Throttle Position Sensor Timing Belt is new and Covers have been pulled by Subaru dealer to check New ECU Vacuum appears to be fine and that according to 2 different mechanics and one of my friends who came over to look If I reset the ECU and then drive the car it runs perfectly for around 15 minutes. Then begins losing power at low rpms, Once the revs reach 3000 rpm or so it is like someone flipped a switch. I welcome inputs as I have thrown parts and money at this car until I am losing hope.