shuddering bob

i recently purchased a 90 granf marquis gs the car ran sounded and looked awesome a few days latter takeing off at light it started sputering and hesitateing at 30-40 in second i can gun it and the shakes go away till i try to maintain my current speed check engine light comes on after about 10 miles any ideas also dies periodicaly and shdders if kept at 35
i have goten autozone to give me the codes o2 sensor high exhaust presure and lean fuel always 41,91,34

Instead of guessing at it, seeing what the check engine light has to say might be a good start.


i recently purchased a 90 granf marquis gs the car ran sounded and looked awesome a few days latter takeing off at light it started sputering and hesitateing at 30-40 in second i can gun it and the shakes go away till i try to maintain my current speed check engine light comes on after about 10 miles any ideas also dies periodicaly and shdders if kept at 35

well ive changed the 02 sensor ant the fuel pump but im still haveing hte shakes not as bad though