sometimes my car will start ,rev up ,rpms go down and then die. i try it again does the same thing but only revs up then it dies. after trying to start it finally it will start perfect. also the voltage goes down alot!. i bought a new maf sensor and alternator. it has run fine for about a week and today it starts doing it again. and the battery is low again even with a new alt. why does it do this, i've done everything i can think of.please help

 

Did you replace the MAF relays with the sensor?

 

no when i go to buy one what do i ask for?

 

Maf burn off and maf power relay

 

so is that it?

 

today my car runs great????? i found a vaccume leak and fixed it but i doubt that was it