Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Could be lots of things . Check engine light on ? What codes? Check fuel pressure. Possibly plugged fuel filter. Possibly plugged catalytic converter. Possibly a vvt issue ...
Sent from my SM-N920P using Tapatalk
The following user(s) said Thank You: George saavedra