this seems to be a big problem with tpi motors and so many different things that can cause this. i have been reading many of the threads on this. my car is an 89 gta 350 it surges at idle and cruising speeds, i have replace the plugs, wires, distributor, cap and rotor, O2 sensor, mass air, cleaned the throtle body. my egr holds a vacume, i tryed to check my fuel presure but my gauge is missing the thing inside to push down the shrader valve, i checked my injectors and found that 3 on the left bank are bad 5.7, 10.1, and 11.0 ohms. all the others are at 17.0 ohms. i have been told by several people i know that say even though three injectors are bad it wont cause it to surge. it also has code 34 and 44. any help would be greatly appriciated. thank you

 

Start with what you know is bad. Code 34 is the MAF sensor. Find a junkyard maf to swap in (since new ones are expensive). Replace your injectors too. You can save the oxygen sensor (code 44) for a little bit later, but I'd replace that too - it's only a 30 dollar part from a chevy dealership. By the way, when you replace the O2 sensor, make sure you buy the dealership unit. The bosch units don't work well with our computers (do a quick search, you'll see)