2000 Toyota celica gt burning through spark plugs in about a month?

Kms Pathinder

New member
as title says in 2 weeks they look worn then in a month ive had 2 sets that i put in i cant figure out why they're burning so fast mechanic friend said carbon build up but i consistently run sea foam in gas for that he suggested b12 cleaner for gas so i put that in this tank see if it helps clean out some and fix problems any well thoughtout/researched answers or past knowledge answers to this problem thanks
theyre gapped right o2 sensors are working fine, its probably timing as you said its idling slightly rough occasionally and when it does rpm drops to about 350 from around 750 when a/c is off it doesn't seem to do it when a/c is on
 
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