i have a 93 hatch with a 99b18b swap.. i was driving the car a couple days ago and gave it a lil gas.. in the middle of 1st gear my rpm gauge started moving up and down rapidly then then engine stalled .. the car sat for a day and finally started and i let it idle for a couple min.. rpm gauge did the same at idle and then it stalled again after 2 minutes and hasnt started since .. need help on what it could bee

 

ii've never had that problem, but check your fuel, like filter, pump, also check ur spark plugs, dizzy, you know things of that nature , just givin some ideas

 

A friend of mine recently had a problem where his 1990 civic would shut of while driving ( i don't know if his rpms jumped around). This happened for a couple days then finally on morning it would not start. He found that his civic was building up vacuum in the gas tank. His gas cap was not venting. Replaced the gas cap, problem went away.