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Took the TA out Friday and wasn't running right, first time it has ever happened in my ownership. It's a 1999 30th anniversary Trans Am, I have owned the car for 20years now. I changed its oil this May, has been sitting on a trickle charger since, I rotate other cars and just haven't gotten it out yet.
It seemed to shut down/bog down under wide open throttle, ran a little rough at idle and start up. This has never happened before as I mentioned. Curious if anyone has had this issue. I was going to start with the plugs and keep trouble shooting from there. Car has a number of mods, except internals (Longtube Headers, LS6 intake, MAF, Whisper lid, etc.)
What spark plugs have you guys been using, liking, etc?
I missed adding Stabil last winter to my 02 Z28's gas tank just before storage. In the spring the car ran poorly even cut off a few times the first drive this year. Week of driving sorted out nicely adding fresh gas.
I don't like the crappy E10 gas that's 99% of what's available .
Bad gas (if not properly treated with Stabil as mentioned above) or low fuel pressure is most likely issue here, assuming you don't have any codes (no MIL/SES was mentioned). I'd put a fuel pressure gauge on it and check pressure under load (unless it's already too low under no load, then you know this is the problem).
I have several limited use vehicles too, my '98 Z28 gets driven least of the group. But my minimum standard of driving is one tank of gas per year, and then I always refill with Stabil and Red Line SI-1 added to prevent any fuel system issues. Do you have a set routine for ensuring that fuel stays reasonably fresh among your collection?
To add to the old gas theory, theres also a difference between summer blend and winter blends in gasoline. That could cause hard starts and rough running conditions.
Money on low fuel pressure. Is it throwing any codes? I wouldn't mess with changing the spark plugs, maf etc. until you get a reading on fuel pressure and codes read. I can't imagine a check engine light isn't lit if its bogging down and struggling.
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LS1 Engine bogging down 
