just wont rev

put new gas in the 90 yesterday and got distracted didn't get a chance to check it out, today had an appointment at the hospital.

Unfortunately, water in the fuel isn't gunna go away. The amount of ethanol they are putting in is the main cause, but some stations also have really old tanks that have water in them.
Water in the fuel can certainly cause plenty of problems, from fuel pumps/filters, to infectors. Water don't burn very well...unless you have a hydrogen powered vehicle....

Hope it turns out to be something simple. Howard.

took the 90 for a drive wednesday afternoon (4 miles to the americian legion- had a drink ) the 90 ran a little off normal that i attributed to the computer making adjustments to my repairs anyway i got about 2 miles from home then #$%^ happens again same problem. i now believe it is an electronic heat problem. anyway i got the 90 home it completely shut down on the front lawn i waited for 2 hrs and went out to put it inside same problem (first time it has ever been out all night). this morning i went out did a little checking to no avail got in it started up immediately idled fine and a moved it in front of the garage. i did notice on the slow trip home the instrument panel where it shows miles / gal and various other things flashed what i believe was  SYS every time the 90 lost power then it went away. any ideas?

I think you're looking at a failing ignition module, Howard. Classic symptoms. The "SYS" on the dash readout usually has to do with the traction control/abs, but I'd need to check on the '90. Perhaps Dave( eddie20890 ) would know, since he has a '90 model. It would help if there were any codes...

|UPDATED|7/13/2012 11:18:45 AM (AZT)|/UPDATED|

I agree with Joel....it sounds like symptoms of failing ign. module....eng. hot no and/or poor spark...engine cooled down ign. system works great until hot again. The SYS light can also come on with a weak/failing battery even though the charging system is good ( not meaning to imply that's your problem..just sayin' )

it has a new battery (been checked twice ).

This is a pic of the module...remove the dist cap and rotor and you'll see it. They can be tested at some parts stores .but IMO a waste of time when the module in your case may be intermitant...they would be testing it cold..not hot when you have your issue. As i said in my post i didn't mean to say your battery was bad..I was simply saying that is one thing which can turn on the SYS light (usually with out your running issues) as will ABS..ASR and believe it or not sometimes a aftermarket radio 

started researching distributor modules for the 90 (only corvette would do this)guess i will run the codes and check which module is on the 90 tomarrow.

|UPDATED|7/13/2012 8:14:34 PM (AZT)|/UPDATED|

The module is inside the distributor. You'll need to remove the cap and rotor, as has been noted. Then there are two small screws that hold the module to the dist., and two wire connectors. These connectors get brittle over time, so if you change the module, be careful unplugging it. New modules usually come with a small package of grease....USE IT. It needs to be smeared all over the bottom of the module, where it fits on the distributor. Not using this grease will cause the module to overheat quickly, and you'll be right back where you started...replacing the module. Sometimes, a bad coil will cause the module to fry, too. It's best to replace the coil if you replace the module...