I recently got my car tuned with greddy kit, problem is, it doesn't wanna start when its hot(its with stock sparks) and there is a spike at arround 4300-4500 rpm when i put the gas pedal down(the injectors are stock) Air to fuel goes to about 12.5 and up on 6700 rpm, when its normaly arround 10-11.

P.S. Car is 2004 192PS 5speed MT

Any suggestions on what i should buy or do?