It stalls after it warms up but then will restart after 10 mins only to restall again in 15 mins

run fault codes
check for wiring on crank shaft position sensor or cam position sensor/s
it will be something that was affected by the belt replacement procedure

Did they figure out if you are loosing fuel or spark when it fails to start up ? You would need to know which to proceed.

Take it to a properly qualified and licensed mechanic you know and trust.

when it stops running need to check for fuel and spark

You need to test the electronics for fault codes, to do this follow the instructions here.

it sounds like the coil pack is bad. if you can get the car to auto zone they can check to see if there are any codes this will give you a better idea of where to start.

are yougetting any codes could be a number of things really weak battery,alternator,something in emmissions, clogged catalytic convertor.and o2 sensor gone bad

a bad crank sensor can cause this. shuts off while going down road, and will start about 10 min, later with no problems runs fine until it quits again. hope this helps,

i had the same problem. found out its the fuel safety switch. try that.

I would look to see if you got a broken ground wire!!! witch are a big thing on todays computered cars. I know you have dumped a lot of money in your lawn ornament but one unhooked or dirty ground wire not making a connection can reak havick with everything, I would chk.for ground issues like around the fuel tank and where they hook to engine to body to frame or k-member.