The other day on the way home from work, my 88 2.8L camaro suddenly started sputtering, and then backfiring. I managed to get it home, replaced a worn rotor and distributor cap to rule out crossfiring and it still existed. It is backfiring through the intake too, I pulled the code and it gave me the MAP sensor, but I don't know what the thing looks like or where it is, it wasn't in my Hayes manual. I'd appreciate any help. Thanks.