1990 Chevy Corvette run bad when warm

I don't know what other problems you have read, so could you describe what's going on?

and if you have tried to do any testing?

90 VETT CAR RUNS VERY BAD WHEN WARNED UP RUNS LIKE EXH STOP UP WILL IDLE BUT WONT TAKE FUEL. READED OTHER CUSTOMERS PROBLEM ON WEB SITE SOUNDS ALOT LIKE MINE TESTED RESISTANCE ON INJECTORS GOT READINGS FROM A LOW OF 8 OHMS TO A HIGH OF 17.8 OHMS I THINK YOUR TECH RECCOMMENDED TO REPLACE INJECTORS ON OTHER VETT IAM NOT SURE BUT THINK RESISTANCE SHOULD BE ABOUT 1-2 OHMS CAR JUST HAD MAJOR TUNE UP HAS GOOD FUEL PRESSURE IF U HAVE A MINUTE AND CAN LOOK AT WEB SITE COMMENTS ON OTHER 90 VETT THERE ARE A HOLE LOT OF SMILARITIES IN THE TOO CARS THANKS FOR INFORMATION

I am not going to read about the problems for some other car. I would have no way of knowing if each and every symptom was the same as yours. or if you have symptoms that they did not.

So after the engine is at normal operation temperature, you can not get it to run above idle?

YES NO POWER OFF IDLE THINK MAYBE INJECTORS HAVE PROBLEM

will it rev in park or neutral?

TO A POINT, RUNS LIKE CAT IS PLUGED UP, BUT ITS NOT EVEN WITH EXH OFF STILL WONT REV UP

do a test to see if it's because it's starving for fuel.

while working the throttle, spray starting fluid in it in an attempt to get the RPM up.