Friends 2.5 in his forester. It ticks like a bastard but its done that forever. Recently it has started holding back/misfiring/popping at around 3-3500 rpm. Sometimes he has to stop while driving because it does it so bad. If he holds it to the floor and lets it eat, then it sounds exactly like antilag. Have gone through multiple tanks of fuel so not junk gas. Changed fuel filter. Changed plugs and wires. Swapped a coil off my spare motor on. It does it hot, cold, after 30 seconds of driving or after 3 hours. All consistent. Any ideas? Ive never seen anything like it. Im thinking maybe his fuel pumps letting go? He gets all hot and bothered over compression so he checked that and its perfect. Told me he also changed his knock sensor?? Trying to help him figure this out. Clogged cat? The car burns oil like CRAZY. Thanks
-KB
-KB