hmmm yara if its on cng get the cng advancer chkd, and the unit chkd the main cng unit, chk for any carbon in the carburetor, i know its EFI, but the throttle area chkd, as far as i can get is that get it tunned and also chk the ecu cuz this car is totally circuit based so it might b any circuital problem, do lemme know what was the problem, if u need a mechanic do let me know i have a good one that i know, my cell num is 0333-3739698, lemme know.