Drove my 90 vette L98 yesterday to work, no problems. Coming home went to take off from a stop and out of the blue car started to sputter when giving it gas no acceleration. Stalled a few times, was able to restart it after a few tries. When restarted couldn't get it to move faster than about 15-20 mph. Finally it wouldn't move without stalling and needed a tow home. Changed the IAC today no change. Installed new fuel pump last November.

To be honest; there is a lot more that needs to be done/checked for a proper diagnosis of what could be the problem.

Ok, thanks

I recommend checking the fuel pressure first.  When is the last time the fuel filter was replaced?

Replace the EGR electric / VAC senser. And the computer (ecm) . All problems will go away. Ecm first. You may have trouble finding the sencer. If needed.

I replaced my fuel pump and shortly after the car would die on me while driving, but once off the road it would restart. Turns out the sending until wires were corroded and the movement of the car would cause the connectors to lose contact. Just saying, you did the pump last fall. You may want to take a look.

I had a very similar symptom. In prep for Corvettes at Carlisle 2017 (last year) I took my '92 out on the expressway and went full throttle. Immediately it started misfiring. I limped home on what felt like 5 out of 8 cylinders were firing. Would not maintain idle without nursing the throttle. Check fuel delivery; good. Read a lot on this and corvette forum. Called fuelinjectionconnection.com. The injectors were original and they said it was probably shorted coils. It turns out that factory injector's coil are cooled the with gas. And with only four days before departure to CAC I decided to purchase a set of Bosch 3 24# (stock are 22#) injectors with over night shipping. Install took ~ an hour. Starting and drivability were instantly improved. Full throttle performance was way improved. Scared me at first but have certainly gotten use to that kick in the pants (so to speak). In addition to the fix I learned more about wet coil injectors, BTU of ethanol vs pure gas and why the 24# injectors seem to improve full throttle, corrosiveness of ethanol, etc. I also read somewhere that you can use a multimeter and measure the resistance of the injector coils. Most likely that info came from the corvette forum or the folks at fuelinjectionconnection. Happy troubleshooting!

|UPDATED|9/11/2018 8:32:45 AM (AZT)|/UPDATED|

This is called "shotgun troubleshooting".   No analysis needed.   Just keep throwing money at the problem, and maybe you'll get lucky!