replaced coil pack.... bad idle and back fire

[jizzle16]

so since February 2010 i haven't started my car. i just got done replacing the coil pack. 1 & 3 on the old coil pack was really burnt. so i got to start my car today.. the problem is that its idleing from 500-700 but it wouldnt go pass that. also when it goes to 500 rpm it back fires... so what is wrong with it now??

 

[gofer]

Check your timing before you start it up again. For whatever reason the timing belt tensioner might have let the timing belt slack a bit while the car was sitting, then when you started her up the belt might have slipped a few teeth.

Quick Timing Belt Check