Runing probems

Have a 1994 Oldsmobile 88 with the 3.8 liter engine , had it towed home twice after it won't start after sitting . I had the ignition module tested at the parts store was ok , after I had it towed it would start up the next day .I checked the fuel system ,filter ok ,fuel pressure 38 pounds when runing ,I hooked up a vacuum gage has 17.5 in pounds of vacuum ,but when it stops runing it still has good spark and trying to restart it won't pull any vacuum ,could it be the throttle sensor? I also installed a new camshaft sensor .Need help what's next .

Welcome to AF. You should try to spray carb cleaner into the intake when this happens, if it starts either you have no fuel pressure or the injectors are not being pulsed. First step in the diagnostics.

Welcome to AF. You should try to spray carb cleaner into the intake when this happens, if it starts either you have no fuel pressure or the injectors are not being pulsed. First step in the diagnostics.Will try it ,I don't understand why I didn't think of using it ,have done that many atimes before,must be my age .Will let you know what I find.