When my car idles every 15 seconds or so it will rev up by itself to around 1000 or 1100 rpms. Also when I take of with full throttle it boggs down or the motor is kinda missing. Also when going around 70 with the pedal to the floor it will not shift higher it gets to around 4500rpms and the rpms drop and it kinda studarders alittle. The weird thing driving normal there is no problem but when you give it gas it hesitates and kinda boggs down the rpms just go up and down.

The check engine light is not ON!!!

Could it be bad plugs,Injector...or could it be a air sensor.


Any help or suggestions would be greatly apreciated guys.

 

Oh yean it's a 94 Formula A4. 188,xxx miles the only mod is a flowmaster catback and it has straight pipe in place of cat.