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Is your Astro high mileage? Over 100,000 miles? Could be the EGR valve. Have a mechanic check the functioning of your EGR valve, which can get plugged up by carbon from the exhaust; the ECM will then make your mixture richer, which will decrease your mileage, and also help to plug up the EGR valve even more. Expect to pay around $200 for this repair. Your prices may vary depending upon region. Once the mechanic has the diagnostic device hooked up to your Astro's ECM you can find out more about your 4.3's repair needs, and let you plan future repairs. Good Luck!
Assuming your plugs,wires,dis cap,and rotor button have been replaced.The number 1 cause is the fuel injection.I forget now what they call it..csfi i think,anyway you convert it to multiport injection.The part is about $350,bosch makes it,any good parts store will have it on hand.comes with all injectors and fuel regulator all in 1.Chevy had a service bullentin about it years ago.When it goes out it causes a very rough idle,very rich condition to the point it puffs black smoke when revved up,gas mileage is about 10 miles a gallon...
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350 tpi fuel pressure?
Your fuel pressure drop could be do to a clogged filter, pinched line/hose, or a weak fuel pump. You should have around 35 psi at idle and 43 off idle. I hope this helps answer your question.
