![]() ![]() The car starts fine and is drivable until it warms up, about 6 minutes. I am having the exact same problem with my 1998 QX4 which has 150,000 miles on it. I have lurked long on this forum and have always found great advice here. That said, I'm not going to sink thousands of dollars into it at this point. I am not ready to give up on this Pathy just yet. If it all there might be a few more things I can try I will. But I find it puzzling how it went from running so good a few weeks ago to running good again to running so bad today with no warning. ![]() I realize that this is an old vehicle and it really doesn't owe me anything. If I press hard on the pedal it it goes putt-putt-putt. ![]() unless I am really delicate with the accelerator, then I can seem to get it to run almost normally. It idles rough, cold or hot start, stalls at low RPM and chugs and bucks at cruising speed. I don't know if it is coincidence or what but the problem came back with a vengeance today. I ordered a replacement air duct (much thanks to m0nkeyprince for the part number or I never would have found it) and installed it today and drove away. In fact, I drove it for a week like this and had no problems. For good measure I replaced the fuel filter as well. To test this theory we threw some duct-tape over the crack and tried to seal it as best we could. Well my dad and I poured over the engine and sure enough a crack had developed on the underside of the air duct. One guy suggested that it could be a vacuum leak and to check all the hoses. anything from the timing belt, ignition module, fuel pump, fuel filter, blown head gasket. Then last week it started sputtering HARD once the engine warmed up or you rev'ed the engine past 3K RPM. Have had all my belts, plugs, oil changes done like clockwork. I have been religious with the maintenance on this car. I had a few intermittent sputters (nothing serious) but with so many miles on the vehicle it was an ominous sign. But it was running like a champ up until a few weeks ago. ![]()
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