engine earthed ok?
alternator charging fine-not overcharging?
all engine connectors fine...correctly wired? particularly the coolant temp sensor,phase sensor/cap/arm/connectors fine-water hoses beside phase sensor not spraying a fine jet of water onto cap?[happened to me once with a 2wd cossie-fine jet of coolant out of the hose]
ht leads good-all..
map sensor mounted well/working well,hoses/integrity fine? wiring correctly shielded?
timing not moving around[mechanical]-ie keyways etc
tps working fine-wired correctly to suit the ecu?
as said above you need to watch/check afrs and fuel pressure as it comes onto boost

good luck!-keep us posted