I have an 91' RS with a 3.1, heres the problem when it starts it will choke out after about five minutes.
when hooked up on diagnostics the injectors showed up as staying open to long.
This is what has been changed the computer, O2 sens, and MAF.
anyone have any ideas of what is going on here.
The timeing is ok.

You might want to check the fuel injectors and see if they are clogged internally by sending them to CruizinPerformance to be cleaned. If that doesn't work, then I would get a new set...

Also check the injector harness for bare wiring.