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Message: <blockquote data-quote="red9535" data-source="post: 203870" data-attributes="member: 9737">My Mustang build is almost finished. I'm having a misfire problem though!It's a mildly built carb'd 302. Cylinders 4 and 5 miss at idle.. and as you climb the RPM's, they seem to start to fire, as it smooths out.Here's the news so far:All cylinders have good compression and the block has good vacuumCamshaft lobes are fine, all valves open and close properlyBrand new spark plugsBrand new wiresBrand new distributorMSD 6A box is working fine (swapped a new one in and it didnt make a bit of difference)The only thing I haven't replaced is the coil - but i dont see how a bad coil would cause 2 specific cylinders to not fire unless there's engine load, in whcih case SOMETIMES they fire.Just strange.</blockquote>