so in driving the car, i am, on occasion, getting a funny stumble ,like i lose 30 or so hp and the CEL will come on. but it goes off almost immeadiately and the stumble will go away .for awhile. then it repeats.now i know that code 33 is MAF signal voltage is high .what im trying to find out is...why. the FSM says that the MAF gets its power from the fuel pump relay. could it be going bad? causing the MAF to get too much power? any guidance on this ???

 

so I unplugged the ECM fuse by the battery,waited 30 minutes or so.and when I reconnected it and started the car it stumbled a bit then smoothed out nicely.no CEL and everything SEEMS ok??!? drove it 30 or so miles and its smooth as butter.i guess that is what is meant by "intermittant"?

 

The code is for the ECM seeing a air flow rate indicated greater than what it expects at a certain time / conditions;
not too high a voltage from the battery

http://www.chevythunder.com/maf_code_33.htm