check your socket out good, look for rust bad wires to the plug, and check the front on the same side, sometimes one bulb makes others act up sometimes.
pick up some di electrical grease and put it on your bulb contacts.
What he said plus replace bulb.
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2005 GPGT- Top Swapped Click me!15.5 @109
2002 GPGT- slow and stock
1993 Oldmobile 88- exploded the diff @158k GPF Resident Flowmaster Troll