I have a '91 lexus ls400 that has 89,000 miles on it but i had let it sit in my garage for 6years , i drove it a few times here and there but rarely . well now i miss it and it wont run right .
i havent drove it aat all the last 3 years and now it like bogs down like its running out of gas and idk why ??? i replaced : mass air flow sensor , crankshaft sensor , flushed gas lines , put new gas in it , fuel filter , cleaned injectors !
First thing ya did wrong was letting it sit that long without even starting it every once in a while. The problem could be a number of things. Check what you have for fuel pressure to see if the fuel pump is working correctly. Just b/c it feels like it's a fuel problem doesn't mean it is, it could be ignition related, check resistence on the coils, plug wires, and stuff. Also, a very good possibility is maybe some little rodents built a nest in your exhaust and it's clogged. An exhaust shop can check the pressure or you could unhook the exhaust before the front cat and see if it changes anything.