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tell me parts you replaced sound like low compression or intake vacuum leak.replace all vacuum hoses, do a engine vacuum test and check compression see if engine has vacuum leak at intake manifold or worn out valves.
Check the fuel pressure at the Carburetor or fuel rail, depending on which you have. Most likely the gas that was in the rail or carburetor has dried out and gummed up the injectors or needle valve holes. To verify, if you have a carburetor you can pour a small amount of gas in the throttle body of the carburetor and try to start it. If it starts that confirms the problem and you will need to clean the carburetor with a rebuild.
Get a spray can of either (starting fluid) While someone cranks the engine spray SMALL amounts of the fluid into the air intake. I stress small amounts a little at a time so you don't blow the engine. If the engine does start I would check to see if you have water in the fuel system first and if not I would check the fuel pump pressure.
There are three kinds of 302s made from 1982-2001.
5.0L HO This engine was used in 1983-1995 Mustangs, Mark VII Lincolns, and some T-birds and Cougars. All Explorer 5.0L engines are 5.0L HO engines as well. They use the 351W firing order, 1-3-7-2-6-5-4-8. Except for the 1983-84 Mustangs, all of these engines are roller cam equipped. They use a reverse rotation water pump and front cover. The 1994-5 Mustang and all Explorers use a unique front cover and water pump.
5.0L Full Size Car This engine was used in 1982-1990 Crown Victoria and Grand Marquis. They use the 289-302 firing order, 1-5-4-2-6-3-7-8. Most of these cars are not roller cam equipped, however sometime in the early 1990s they started using roller cams but retained the 302 firing order. They use a standard (clockwise) rotation water pump and front cover.
5.0L Truck (except Explorer) These engines are similar to the Full Size Car engines, except they use different intake manifolds and camshaft profiles. They also use the 289-302 firing order, 1-5-4-2-6-3-7-8. They also began using roller cams sometime in the early 1990s. They use a reverse rotation water pump and front cover.
Do you have an Oil Pressure gauge? If not you may want o have one installed (even temporarily). After the vehicle sits overnight, start it and see how long it takes to get pressure. If it is the same amount of time that the engine knocks, then you may want to start looking for another engine. If oil pressure is okay, you might have a bad wrist pin, which can make noise for years without any other problems. Now if the noise is a "ticking" then.............
Be sure 2 check fuel supply, electric pump submerged in old fuel will collect varnish around the armature. Quick diagnose is a short blast of carb. clean (with air breather intack case of back fire) injected through vacum port at intake manafold. Remember just a short bast.
Make sure the inside of your throttle body doesn't have a gunk build up. If so, clean in out with some carb. cleaner really well. If the crack is plugged up in the throttle body, air cannot get into the engine at idle in which the car will die. Are you running an aftermarket cam? If you are, drill a 5/32 hole in the center of the lower half of the throttle plate in the throttle body. This helps a great deal as well.