astra troubles

[edgiii]

hi,havin big trouble with me astra sport ecotec.started by cutting out and poor starting,now only starts if i disconnect the crank sensor or let the fuel pump run for 20 seconds[which its not supposed todo]then it backfires inti life but runs like a bag o **** and cuts out.so after visit from hometune and new crank sensor no change,rewired to ecu to eliminate interference?.changed cam sensor/battery/plugs+leads/coil pack/alternator/ecu bench tested+major codes wiped[showing voltage drop]all on advice from hometune[it,s gettin f***ing expensive now]still the same and now ticking over at 500 rpm.any advice much appreciated:

 

[edgiii]

sorted

thanx 4 the help lads,sorted it now ,turns out vauxhall genuine parts at top whack don,t actually mean they work.cost me £300 since xmas doing jobs that did,nt need doing