Try to see if you are getting fuel up to the carb by pulling of the hard line and have someone crank the car hold line away from yourself and into a bowl or cup. The fuel filter is inside the carb i belive (if its a quadrajunk) also check that. If it is fuel injected check fuel filter should be back under the car near tank discenct and see if you are getting fuel.
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Usually because of an ignition or gas related problem. You need to check for spark at the plugs and for gas at the engine.
A quick method to check for a gas problem is to spray some starting fluid into the air intake on the throttle body. Take off the big boot from air filter housing to the engine, spray a shot of fluid into the engine, then try to start it. If it fires up and tries to run from the fluid for a few seconds, then you know it is a fuel problem. Maybe the fuel pump has quit working, or the fuel filter is clogged. If both are good, maybe a fuel injector circuit problem, less common but possible.
If nothing happens from the starting fluid, it may be ignition related-not getting spark. Pull off a spark plug wire from a spark plug and hold the plug wire end terminal about 1/4 inch from an engine bolt or ground. Have someone crank the engine over from the key and watch for a consistent, blue, snapping spark. If no spark, test a few other plug wires to verify no spark at all. So it is not just one ignition coil not working, but none of them produce spark. No spark means the ignition system needs diagnosing. Sometimes it is the ignition control module that goes bad-it can be tested at any parts store. Post back and we can go from there.
will the engine crank when you turn the key, and will not start or does nothing happen when key is turned on. If nothing happens when you turn the key, you may have an dead battery. if it will crank and not start, may not be getting fuel or the engine isnt fireing. Check fuel first, then check to see if it the spark plugs are getting fire.
So you turned the key just to "Run" and hear the fuel pump running (guessing elec pump)?
Did you pull off a spark plug wire to check for spark? If no spark, pull the Distributor cap and check inside of cap, and rotor for damage, if ok, then the coil is bad, replace it.
If you have spark at the plugs, have you tried Starting Fluid? (old school, go to AutoZone for this)
youre p0300 code is radom miss fire,usually cause by bad wires or bad coil pack,p0304 indicates missfire at cylinder 4,cause bad wire or plug.p0335 indicates crank sensor circuit malfunction can cause all of the above,because its part of the timing position for the spark at the plugs,iwould check crank sensor if its within specs!
I too, once owned a '95 z28, fun car to drive, anyway HO chevy small blocks w/EFI are notorious for being beasts on a cold start. Try this when you get ready to start the car turn the ignition on but don't start let it set there a few seconds you should hear the fuel pumping waking up. Now instead of holding the key and letting it crank and crank, just hit enough to let the engine fire. Not only will lengthen the life of your starter it will lengthen the life of the fuel pump.