Misfire and Lean. Any Suggestions?
I have a similar problem, only mines is when you floor it.
I bought the car about 2 month ago and its been in the garage and engine has been rebuild. I'm stuck on this misfire codes that keeps popping up.
P1471, P1472, P0300, P0301, P0302, P0303, P0304, P0305
Under normal driving up to 70 mph it would run smooth and no codes will pop up. It's when you floor it at any speed even from stand still, that the check engine light pops up when the rpm reaches around 6000. The car lags all the way up to the 6000 rpm point and misfire randomly until you stop and restart the car. After restart it'll run smooth again like usual.
I have done:
spark plugs, wires, and all coil
have open up both VIS, cleaned, soldered and resealed
checked hose, manifold (exhaust and intake) for leaks
checked and cleaned MAF
brand new timing belts(front and rears), accessory belt, air filter from when rebuild
refilled transmission fluid and front differential gear
checked all injectors with noid light(haven't bench flow test)
check for sparks at all plug wires (ok)
I'm pretty much stuck and it's still doing the same thing. I might be able to come up with some more tested on more of the electrical but for right now bumbed out. Anyone have any suggestions on what else to look for, it'll be a big help and greatly appreciated.
I will keep post on the status of this problem until it gets squared out.