Carb issues?

[wayfast1500]

I just took my charger out for the first time today.  It runs real well, but if I step on it at cruising speed it almost has a flat spot/falls on it's face almost stalls.  When it gets past this I can hear either a cylinder misfiring or pinging.  This caused by a dirty fuel system? Wrong octane (87)? Carb out of adjustment (stock 2bbl 318)?

[c00nhunterjoe]

first time since when? could be old nasty gas, could be timing way off, could be a gummed up carb, or all of the above.

[wayfast1500]

Last time the car was registered was 05, I've been starting it and letting it warm up atliest every other day for the past few months.  I put 5 gallons of fresh gas in today.  I think I'll add some seafoam to see if it will flush the carb out?  New carbs look cheaper than to rebuild it so I might go that route if that doesn't work.  Should I try to retard the timing a few degrees?

[c00nhunterjoe]

check the timing with a light first.

[wayfast1500]

Plug 1 correct? Drivers side front? Disconnect vacuum advance?

[y3chargerrt]

Correct

[Runner]

might try putting a new set of plugs in it