1994 taurus 3.0 with 82k miles. Getting a rough stumble on cruise and idle, and an occasional backfire under acceleration. fuel pressure is steady at about 35psi on idle, but when put into gear with the breaks on it fluctuates between 30 and 35. when disconnecting the vacuum line from the fuel pressure regulator it stays solid at 40psi. is this normal? other things i have replaced include MAF, EGR, ACT, plugs, plug wires, cap, rotor. only trouble code is 565-canister purge circuit failure. no check engine light comes on though. vacuum seems fine to the evap canister. could that also be a problem? thanks in advance
Sep 5, 2008 at 10:00 AM