Hey guys I am posting this for my dad. He has a 2000 pathy 3.3 5 speed. Has about 240k km's. He had all the timing belt stuff done last summer and just after that it started having a p0300 come up but only when it idles for more than 10 or 20 seconds and you can definitely feel that some thing isn't right. It seems to run fine other wise and has great power (well as much as the vg does at least). It has a new cap and rotor, new wires, plugs and air filter. It doesn't hesitate or stall at all on take of and starts up quick every time.
The shop said they can't diagnose it all they get out of the ecu is codes p0300 and p0446 but they said the 446 is evap related. They think it could be clogged cats but he doesn't want to spend a grand on a set of cats unless that is for sure the problem.
Thanks in advance.