Inconsistents values of acceleration with acceleration sensor ADXL335 and MMA776

Hey there.

Yeah, I use those accelerometers.
I will try to fix properly the arduino card, the MMA7760 and its wires on the front of the car.
Do you have any advice concerning what I should do now or do you need anymore information? The only problems were that I didn't fix the accelerometer properly and and there was the EMI, so now it should work fine right?

Greetings,
Kevin