Ok today I started my car and it ideals fine I let it warm up a bit and I am off while accelerating my car shutters violently I mean rattles the windows violently! After it shuttered I let go of the gas and eased on it again and as long as it’s below 1500rpm it does not shutter I tried flooring it once and the car died! Flat out I started her back and it was still shuttering once temps reached about 160 the car was fine ran like it always has.. After it sat for a while I started it again same problem! I have checked all the plug wires cause I installed new headers about 3weeks ago non are even close to the tubes and none is burnt what’s up!?!!??

 

scan it for codes, make sure the tune up is good, filters clear,make sure the wires are on in the correct order. might want to look at the iac or cts.