ok so I bought a 99 gmc jimmy sle not to long ago a couple days after the light came on code said MAF sensor I changed it I also gave it a tune up while I was at it new plugs ,wires cap rotor the whole nine then It began to run rough. it ran perfect before the maf and tune up and after at idle it started running rough and when I accelerate with some force at 45 mph or so it chugs and the light blinks on and off then just stays on. I have since done the fuel pump with lines and the spider injectors still the same exact problem .the only thing left is the cat. ,egr or coil. please help I am very annoyed lol to say the least.any help would be appreciated thank you in advance. Jonas.
