I only drive my car some days inn the year, and I was out testing it on Sunday.. Everything vent fine, but when j let go off the throttle… the engine just stops… It started right after whit no problems. Then a little later, the same..
Then I vent to a friend’s home, and the car stand idling, and just stops many times.. started whit no problems..

Then I put in a different battery, from 60 to 90 Amp.
Drive to an other friend let the car idling for 45 minutes.. no problem.
When driving from him, the car just stops as I had to back up, out from his home…
Then I hade some problems starting it.. But it started in the end.. and I drow home…
When I got home, I stop the car and started it 3 times no problems…

What can be wrong?

 

i had almost the same exact issues as you did last week along with alot of other people. The fuel pump computer is bad, do the fuel pump bypass mod or get a new fuel pump computer. i did the bypass just because i didnt want to invest anymore money in my sc4. its free and takes 10-20minutes.