car dies and tacks go down

you could try some fuel additive, oil additive as a cleaner, that's no doubt a sludge and carbon problem

I have no idea how someone could make a positive "no doubt" diagnosis from a tiny bit of written information. Do some diagnosis before you start throwing money and random fixes at the car hoping to magically fix it. Get the codes read. Your car's computer can often tell you what the problem is or at least where to start looking. There are any number of electronic or mechanical issues that could be causing this problem. Many auto parts stores will read the codes for you for free if you don't want to take it to a shop for diagnosis.