so we havent had this issue in awhile. when we are sitting at a stop light and the ac is on the rpms will drop really low and then spike upto about 1k rpms hold there for a lil bit and then die! the only dash light that comes on is the check gauges? we just replaced the fuel pump, the motor mounts will be next we are about 2-300 miles over for a only change we switched back to synthetic and run lucas oil additive, cleaned the air filter about 8k miles ago and the trottle body we clean every oil change. we also just did our first seafoam treatment since the new motor about 20k miles on that. any help would be great thx in advance guys.