OMG need help fast

cosgig said
Change the #2 spark plug, then report back!! Reason is, we had a 340 Challenger years ago, it was popping through the exhaust. Changed everything, timing chain, carb, ignition, everything... that is except the spark plugs, which were "new". Well, one had a cracked insulator, never saw it and the plug looked fine. Several $$$ later and more time than it should've took, one plug and problem solved!!! At least it's isolated to one cylinder, it should be easy to find!!! Good luck with the diagnosis, Geof

I've had that happen too. About 20 yrs. ago I worked on a 72 chevy 350 that was popping bad through the exhaust and carb and one mechanic told the owner it was bad valves. I pulled the plugs and they were toast. Put in a new set of plugs and it ran great.

mike340duster said
Switch your #2 wire and spark plug to the nearest one and re check if problem still on cyl 2 then u have other issues. if it changes to other cylinder you can go get some new wires,plugs

This is a good easy cost effective way of eliminating that possibility.

Since it's just one cylinder I'm inclined to think it's ignition or cam/valve/rocker gear related that's just affecting one cylinder rather than timing chain related which would affect all cylinders but at 90,000 miles it's do for a timing chain so I'd plan on doing that soon just to be safe.