Im kinda thrown off here guy's alright i did a tune up yesterday spark plugs and new wires also on my 93 ford explorer sohc 4.0l. Now i at first had issue miss-firing but i mixed two wires so i fixed. runs alot better , smoother , no miss now also. But here's the issue i have everyone know and then in park i haven't noticed it in drive yet i will get a real slight small sounding backfire sound
? I did not have this issue ever before. Any ideas? also doesn't happen all the time it seem's like also.
The spark plugs are Autolite Iridium's. With duralast spark plug wires. the plugs are gapped at .54 like there supposed to be.