my fiesta rst is very jumpy and i cant figure out what it is,ive canged the ecu,tps,fan switch,flywheel sensor and still no luck,ive got a bigger intercooler,beiges ,195 chip from msd,k and n,magnex exhaust,new plugs and leads and cleaned all electrical connections,and still cant cure it and ive cleaned the ecu terminals, :wall: it ticks over ok