I have a 98 Jaguar xjr bought it with a misfire replaced all coils and plugs and it fixed the problem but after taking it on a test drive I was expecting vibration under 3k rpm while driving. once it gets above 3000rpm car dose not shake and feels normal. And my fuel economy is terrible eats a lot of gas, don’t know what could be the problem no codes nothing so need help! Please

 

What’re your fuel trims like?

 

Short term B1: between: 2-8% goes up and down.
Long term bank 1: 13-14 percent
Short term B2:-3 to 4% up a and down
Long term B2: 3-7%

 

When was the last time the fuel filter was replaced?

 

Not sure car has 101500

 

Yes I did, though I can't say exactly what fixed it. New coils, plugs , motor and transmission mounts were likely the resolution.

 

Three year old thread? To what are you responding?