yesterday after work i try to start my car it wouldnt start. when i turn my car on on position. the CEl light dont come on but when i slam my passanger door the cel come back on. but once i try to start the car the CEL goes away. also when i try to pound on my intake box CEl come on also but once i try to start it it goes away . but when i pound on intake box and i get lucky enough the car start up? what cound it be? i though it was the starter i replaced it 3 time and i has a new battery. i have a 2000 honda civic ex auto.

 

Intake box????94