1997 Chevy Monte Carlo 6 cyl Front Wheel Drive Automatic 113800 miles
Last wensday my car was running great. All of a sudden last Thursday my car was hesitating when I would take off from a stop. And if the car was warmed up and I started it the rmp gage would go up and down then go to 0 and stall. Then if I was driving and would let off the gas real quick the rpm gage would go down way low and almost stall. I took it in to the chevy dealership and they said it was my mass air flow sensor so we replaced it. When I got the car back it did it again. So I took it back in and they said it was 2 of my spark plugs and one of my coils. So we replaced those last night. I drove this morning and it is 50% better. But after my car warmed up it hesitated again and when I took my foot off the gas the rpm shot down again. I am wondering if maybe my mass air flow sensor messed something else up in my car. I have only drove the car 10 miles since everything was replaced so I am also wondering if maybe it was so guncked up that I need to drive it more. My biggest problem is this car ran great a week ago. Please help me
Could be your idle air control valve, it regulates how much air your car takes in when no gas is applied. It may be stuck closed mostly, causing insufficient air flow when you're not going. This could be the problem. And the hesitating may be your egr valve, which recirculates some of your exhaust back into your cylinders. If your egr valve doesnt open, your motor has to work harder to fill your cylinders with air.