hi im new here thought id try you guys my 1.2 1998 fiat punto engine blew up had engine replaced and exhaust ran fine but then injection light stayed on and the car is sorta hunting and stugleing it seems intermitant tried the sensor on downpipe and changed injection carb can you help thanks phil

any error codes?

try swapping the pulley from your old engine .. sounds like the engine timing is off

make sure plug leads are tight both ends

thanx will do that and see what happens phil