98 lexus gs400 codes po300,301,303,305,307 and 1349, can any body advise on 1998 Lexus GS400

i have a 98 lexus gs 400, its idleing rugh and running the same way, it has 173000 miles. I'll really apreciate it if anybody can advise what may be the problem

by in Gardena, CA on November 28, 2012
2 answers
ANSWER by on November 29, 2012
you have misfirss on almost every cyl i rec a diag from your mech instead of guessing.
ANSWER by on April 19, 2014
the left cam is out of time. the timing belt jumped or the VVT solenoid is bad ,that's on top front of the valve cover with a wire connector going into it. Lastly it could be the cam tube gears are stuck but that's the last thing it could be .