Hi? my 76 280z was starting just fine and stays running till i shut it down. but after i drained the radiator and put in new coolant, change motor oil and i removed the stock intake and i put in a new air intake that i bought off eBay. i also empty the gas tank and put in five gallons of new gas. since then the car starts and idle for about five to ten seconds and dies. when it start it runs between 1000 and 2000 RPM. When i push the gas pedal it sputter or backfires. it sounds like pop pop and dies. it also dies even if i did not push the gas pedal. I can hear the fuel pump running. When ever it dies, when i turn the key it start right back up and runs and dies again. when it dies it dies slowly.

I don't know what going on. Pls help

thanks

Sounds like fuel or air starvation. I'd start at the new intake you put on.

Double that