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UPDATE: Radiator cap was bad, coolant fill cap was cracked on the inside threads, and the only code now is to P0174. (Lean Bank2) I changed the fuel filter and the "filter" side (coming from tank) was black! the fuel that was filtered wasn't dirty though. Anyway, I got some fuel trims...

it doesn't appear to be too much. I have seen 2 cats and labor anywhere from 1100-1800. It seems fair to me. You may want to get 2 or 3 estimates and also have the shop test to make sure both are bad, unless you already have.. Another thing to consider, most times catalytic converters fail...

ok, so I replaced the IAC and the idle is at normal rpm. Now my problem is that the "surge / stumble" still exists at idle. I tried to test for combustion gasses in radiator but cant run the car with the degas bottle cap off. I drained a good bit of coolant and it still backflows into the...

Thanks again joegr. I will report back shortly. Any idea what the thing is I mentioned in my previous post that runs inline on the fuel supply line near the fuel rail?

Thanks joegr for the replies. Yes is runs very smooth at any speed. It only has the issue during idle. It appears to be worse while in gear sitting still. I guess its b/c of the load. It has normal power too. It surges while in gear and sitting still. The issue now is that it is idling...

Hey, Joegr. Thanks for the replies man. It runs extremely smooth at highway speeds. Actually, it runs smooth at all speeds. It just has a rough/erratic idle. It almost feels like a misfire when sitting still. The idle is more noticeable or worse when car is in drive or reverse. I'm...

Ok, I replaced the hose along with a new clamp and also bought a new thermostat just incase it was stuck. I'm thinking it was ok tho. When I started it this time, it idles at 2-3000 rps and if i touch the throttle, it idles up even more and will even hit the rev limiter. It won't idle back...

Hey guys, I am new here and tried to search but after several days of looking I broke down and decided to start this thread. I am working on a 2001 LS v8 w/ 150k miles with the DTC's p0172 & p0174. I am stumped as to what would cause one bank lean and the other bank rich? I have...