I think I have two separate issues. My 2008 Ford F150 with 75,000 miles has a new battery oh 4 months old or so but it is having trouble starting. It starts but it struggles at times. If I shut it off and start it again it starts up just fine- no problems. However, if it sits for a few hours and I try to start it, it acts as though it doesn't want to--it doesn't just fire right up like it should. My husband tested the voltage on the alternator and it is fine. I read online to check the fuses, fuel filter, and spark plugs. Is this correct and is there anything else I should have my husband check while he is at it?

Additionally, my pickup now likes to 'give it the gas' and rev up without me initiating it. Meaning, I barely put my foot on the gas pedal going slow and all of a sudden I get a jolt of power and the RPMS increase quickly then within seconds it goes back to normal. I did this three times in a row in less then 2 minutes then didn't do it again for a few days. It seems to only happen when I am driving 30mph or lower but more frequently when I am driving 5mph give or take in parking lots. Do I need to have my husband check belts or anything to fix this and would this be in any way related to my problem above? would it be a fuel issue? A couple months ago we switched from using Unleaded 85 with the 10% ethanol to Premium 91? with no ethanol.