My olds 88 keeps cotting up,it throws a code under history as maf low.I can watch it on the scanner and maf is normal then drops to zero and engine light comes on and then runs sorry.It will run excellent until this happens,i changed airflow meter to no avail.It did show a passkey code one time but that was it.Someone help before it goes to dealer,it is a 95 lss with 3800 and no supercharger.The traction off light comes on too when it acts up but goes off and engine light stays on.