1990 GMC S-15 intermittent starting problems

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1990 GMC S15
4 CYL
2WD
AUTOMATIC
187,000 MILES

1990 GMC S-15 mileage: 187,000. I'm having a starting problem with my pickup, it is an intermittent problem. The engine cranks with plenty of power all the time. When the truck acts up a tiny squirt of starting fluid into the intake (with air cleaner cover removed and then tightened back to normal before cranking) the engine fires right up every time without hesitation. When the truck is running it responds directly to the throttle and exhibits no signs of sputtering or stalling. The problem most often occurs after a short drive allowing the engine to get warm and after the truck sits about half an hour it won't start. It seems not to be receiving fuel. Last spring I replaced the fuel filter and fuel pump. I live in the Northeast and I am wondering if the thermal changes point to the problem. Any ideas would be much appreciated.

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Your car is equipped with a computer controlled engine management system. An independent auto service center can scan your computer for fault or error codes. The information should pinpoint the malfunctioning components. If a major tune-up has not been done recently, this could be the cause of your problem. Replace the spark plugs, plug wires, fuel and air filters, etc. Also, replace the oxygen sensor. In addition, service the fuel injection system. Clean the carbon deposits from the throttle bore and idle passages.