Looking for advice. I just purchased a 04 Crown Vic P71, extremely clean with 99900 miles on it. When I purchased it, it had a check engine light on, and I put it on the scanner which showed P0174 lean engine condition, bank 2. It has began to have a surging idle, which seems to be getting worse. I inspected all lines within the engine for a vaccum leak, cant find anything. Any ideas? Also when the car warms up, between 20 to 40 MPH, there is a violent bucking, and when it shifts to 4th from 3rd, there is a lag, and it goes into 4th hard. I beleive this may be the torque converter. It does not appear to slip while in gear when you mash the gas. I have had the tranny flushed, and added one bottle of lucas tranny treatment. No change. I have added a bottle of seafoam to a fresh tank of gas and no change. I am taking this car for a 5 hour round trip for thanksgiving, and need advise on wether this should be driven or not, and what the problems could be.