Stock ecu is most likely your problem,when you do your mods and
put on a bigger turbo stock ecu can't handle it.You need an after market
ecu and a tune . :-)
Repco has nulon 1040 in 6ltrs for 50 bucks absolute bargain,been using this for hundreds of thousand ks fantastic stuff,no lifter noise on start up and lasts for 10000 ks my ol 33 loves it.:-) :-)