Having a problem with my 03 focus. Going to work this morning the glow plug light came on and the engine started missing.Starts ok but clouds of smoke and pinking when given throttle when cold.Its better when warmed up.Drove home at 70 with no smoke that I could see but much worse at lower speeds.Had to go into 2nd gear at 30 as juddering too bad in higher gear.Any ideas guys?? I've already spent £760 on it,so hoping I can fix it myself.Any help much appreciated.