This is driving me nuts. Driving home from work the other day I felt some slight hesitation while accelerating, it got progressively worse over the next half mile of road, by the end it would barely idle in traffic. I limped it home and started to diagnose. Car will idle but is very very rough. Finally gave me a P0300 code.
Items I've check/tested/replaced:
New Plugs
New wires
Checked spark from coils (good)
Checked hoses for vacuum leaks (none)
Pulled vacuum hose from FPR didn't see any fuel (good)
Unplugged MAF (No diff)
Carb cleaner sprayed on tops of injectors (o rings good)
Carb cleaner around lower intake/supercharger/TB (no leaks found)
Tested fuel pressure - @idle (rough) the gauge bounce from 40-50psi with a little throttle it stabilizes @ about 52psi at the rail. (ggod)
Boost gauge also bounces and fluctuates at idle, a little throttle stabilizes the boost gauge as well.
I did replace the crankshaft position sensor about a year ago with one from autozone. Ran fine up till now.
I'm thinking about putting a crankshaft and camshaft position sensor in just the hell of it to eliminate those 2 items. Thoughts?
Anything else I should be looking at? Any help is appreciated. Thanks guys.
