We had this problem with two cars that sat all winter --- both needed new plugs and some fresh gas and oil. BTW Gas looses its octane rating the longer it sits - it may have been 93 octane when you pumped it in the fall and closer to 87 octane crude oil by spring!
If it doesn't go away with a little tune up, I'd start to be concerned about a bad cam lobe. But if it ran fine in the fall when you put it away a cam problem is VERY unlikely.
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle