i have a 1997 Z28 LT1 had a over heating problem when smog pump went out got so hot the top of the radiator had a crack in the plastic on the driver side come in it put a new smog pump and radiator in it drove it 25 miles no over heating but when i shut it off and started it back up the temp hand went over to hot and then it went up and down never got it fixed but allso have not drove it just out of garage ever now and then to clean it then it got to where it took 25 to 30 seconds to crank and when it does it has a miss in it till it runs for about 1 minute and i check the oil and it has gas in it where do i start to look for both problems NEED HELP BAD (dont have much money Im disable could yall please help THANKS

 

u got one or more injectors leaking sounds like to me

 

leaking injector(s) or possibly glazed over piston rings . Too much fuel leaking into the cylinder will eventually glaze over the rings which will then allow more fuel to leak down pass the piston and into the oil. This will also cause blowby but this happens in extreme cases. i would first look into a leaky injector.

 

Check the fuel pressure regulator for wet fuel leaking into the vacuum line. Any codes? Check the coolant temp sensor to make sure its working and not telling the PCM the engine is very cold, resulting in cold start enrichment.

Hard to see how the AIR pump failure would make it run hot. It only runs for a couple minutes at startup to help the cat heat up.

Really need to use punctuation. Your post is almost impossible to decipher without it. Hurts your chances of getting help.

 

Are you doing the work yourself or paying a shop to do it for you?

 

I'm inclined to agree with the above mentioned Injector diagnosis.

My 96 Z was actually hydro locking because of #8 injector stuck wide open and dumping a crazy amount of fuel into the combustion chamber. The cheapest way (likely not the easiest considering the trouble we go through to do it) is pull the spark plugs and inspect them. Mine was easy to find because when I pulled the spark plug, fuel literally spilled out of the cylinder.

By the way you may want to consider changing your oil once everything is figured out.