2005 Forester w/ 225k and automatic trans. For months it's been sputtering while accelerating during the first few minutes while the engine warms up, and if I try and push it too hard (i.e. give it too much throttle) it will stall out. When I say "sputtering" I mean the exhaust makes a sputtering sound and the car will loose power momentarily as though the throttle is being let off, a few times per second during the low RPMs of each gear. Then it's 30 min of fine highway driving to work. Getting off the interstate and back into traffic, now the engine's warm and instead of sputtering in low rpms it "shudders," by which I mean it looses power momentarily a few times each second but it's more pronounced and the whole car jerks, w/o the sputtering sound, similar to trying to drive a manual transmission car in a high gear at too low a speed. I could make it go away by just giving it some gas to get it out of the lower rpm range and it would drive fine.Original title before thread merge:
2005 - Sputtering when cold, shuddering/stuttering when warm in low rpms? - SOLVED!
Fast forward to yesterday, we had a big snow w/ high winds & low temps. Car is un-garaged. I let it warm up for a few minutes, but the sputtering was way worse and it would just stall out instead of accelerate. It also stalls during idle intermittently. It's basically undrivable.
Any help would be greatly appreciated!!