I have a 89 firebird with 2.8 in it. it surges while i am driving it. i replaced the fuel filter about 5 mouths ago. I also changed the MAF sensor the plugs distributer cap and router and o2 sensor about 3 mouths ago. yesterday i changed the plug wired and had a friend look at the car. before he looked at it it was throwing a code 13(o2 sensor circuit) 22 (tps) and 34(MAF).He got all the codes to go away and then we test drove it. It was running bitchin for about ten minutes then it start surging again i cant figure it out. It doesn't surge at idle but it does jump from 600 to 1000 rpms. it only surges when i am going and my speedomitor jumps around like crazy. we ajusted the tps but it wouldn't go to the right position that the book says. i tried two different tp sensors (Both used ones) i dont now if that is the problem or not but if anyone has some ideas can you please let me now

 

Did you check all of your vacume lines?