Random Miss at 65-70

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Aholter90

Newbie
Joined
Jun 12, 2016
Messages
32
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Location
Maryland
My GMC is running great, and has been for a while. Over last winter I put in new plugs, wires, cap, rotor, TPS sensor, water pump, and did some odds and ends on the interior. Been using it this way all year, having driven about 10000 trouble free miles.

Then, two days ago, I am noticing it's started to miss randomly at high speeds. No codes, no lights, nothing. Just this little miss, every 5-30 seconds. Where should I start looking to fix it?
 
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