one of the best power and drivability upgrades to a stock or a modified vehicle is an aftermarket ECU.
this is a great option for early fuel injected vehicles running old motronic\ jetronic ECU (gtv6, 75 v6, 75 twin spark, 90, 164, etc)
these options are also available to upgrade carby to injection, if desired.
there are many options available depending on budget and desired outcome.
send me a message if you are interested is this upgrade and would like to discuss.
i also offer troubleshooting electrical\running issues.
thanks