I have a 1986 mazda rx7 na. The car won't idle with the clutch in. I have to heal toe to keep it running at lights. I changed the plugs and wires the plugs were fouled and it fixed it for a bit. But than it started doing it again. I was wondering if anyone has any ideas if it is something minor like a possible vaccum leak or something major like engine problems?

 

I should of mentioned it has full power when I give it gas and pulls hard it is just at idle it won't stay running. It acts like it wants to revs back up twice or 3 time than dies