off idol and flame comming out the exhaust

[DrifteRs13]

Ok, i recently posted a thread about the maf sensor, after i got that on it worked but the idol is way off, jumps from 500 to 1200. also i only have a cat and oem pipe from exhaust(cut). should it be shooting flames when idoling. it costanly dose it. also after drivine for 15 min the car cuts of wile in motion when i put in my clutch/nutral, dose that have somehting to do wiht the timeing. i checked the guage for temp. but its in the middle. im gonna take it to mineky tomarrow, but i needed some input first.