drivability faults galore but no codes,car worse when cold surges badly on start up,stalling at junctions and hesitant no codes ,timing fluctuating 5-31 degrees and injection duration varies a lot scoped crank sensor and found erant spikes so have cleaned flywheel through hole and changed sensor,car not quite as bad but still not right ,customer has done the usaul rounds whith dealers only to be told nothing wrong and no codes,so has changed plugs ,leads and coil all genuine parts,any ideas. sorry for long post