Yesterday i changed my spark plugs and cleaned out my throttle body and until now it was running alot better. However from 5.00pm today it's been loosing power on acceleration and chugging as if it's back firing. The exhaust emission light has come on the dashboard.
I have taken it down the motorwy thinkin it would clear any rubbish out.
E.g . Earlier on i was doing around 120mph with no problem came off at junction and on return journey i was struggling to get to 90mph in 4th gear.
The problem is intermitent and could do with any help!!
please!!
thanks