Well I was coming back home last night, came to a stop light, after it turned green i accelerated pretty hard, not red lining, but in the 4-5 thousand range. It's an automatic, but when i got to about 4500 rpms, and it tried to shift, it just didn't do anything, and the rpms dropped. Scared that I had done something to my transmission, i immediately let off, and when i came to the next red light, my engine stalled. I quickly tried to start it back up, which it did, and then the tachometer bounced around between 200-500 rpms, and if i tried to put it in drive it just stalled.

Needless to say I was not at all happy about this. (nor were the people at that light.)

Eventually after about a minute of sitting in the middle of a 3 lane highway with my hazards on, i was able to pull off by pretty much flooring the gas and putting it into drive, so as long as i keep giving it gas it won't stall, but as soon as i let off it stalls again.

Luckily there was a shop right down the road from where i was that has a very experienced Volvo tech, which i made it to. Although I haven't heard back from the guy there yet, I've also heard he isn't the most honest person in the world, so I wanted to see if anyone here had an idea about what might be causing my engine jump around between 200-500 rpms when it's idling.

It's a 2000 C70 convertible, with 143k miles.

I've been thinking it's either the fuel filter, fuel pump, or the timing belt might've jumped a notch. (timing belt last changed at 67k miles, been meaning to change it soon)

Thanks to anyone who has any input

 

Maybe throttle body?
Maybe it did jump timing also.

 

Throttle body has an extended warranty by Volvo right? If so, I'm hoping that's the case.

 

Yes it has an extended warranty 10 years 200,000 miles.