Car has a 1.8L, Engine stumbles at first acceleration and if you jam the throttle from about 2-3000 rpm. It has no engine codes and I checked the plugs, wires, cap, button, and looked for vacuum leak but none found. Anyone have a good guess or care to coment? Im all ears!

 

Is it carbed or FI?

 

Mass air flow?

 

It is FI and the Vane Air Flow has been replaced, could it have gone bad again that quick? What is the life span of the vane air flow meter/mass air flow? A friend suggested that i replace the throttle position sensor but i have good response through the cycle. Is there a IAC?

 

Try unplugging the MAF and put vehicle in limp mode. See if that changes anythng.