Hello please can someone help, I have a 2003 2.0 Hyundai coupe that for the past month has a horrible intermittent fault. Some days it will do it the whole journey then it could be fine for days. The fault is as your driving along the revs drop and the engine management light flickers on then off very quickly, the best best way to describe it is to imagine driving along and as quick as you can turn the key off and on. I have had it plugged in on a few occasions and there are no stored fault codes which shocks me.
So far I have replaced the
Fuel pump sender (in tank)
Fuel pump relay
I really don’t know what to try next ?