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That "working the throttle a bit" is the clue. Heat from the sun, the air and sometimes the engine can cause a problem with modern emissions controls. All those can raise the temperature of the fuel and cause vapors to leave the vent, go through the charcoal canister in greater amounts than it can absorb and migrate to the intake tract causing flooding. The fix is to open the throttle to let more air in to compensate during the starting process. If the engine doesn't start right away, open the throttle until it is letting enough air in to start firing instead of just cranking. Don't "work" it but just open it until it fires up then ease it back down once it catches.
The underpowered part is a different thing entirely but we need more details to get a better idea of what is going on. The usual suspect is the very lean condition the engine runs in for emissions reasons. The 2500-3500rpm range is usually the worst part of the problem. Keeping the revs up and getting a proper sync for the two throttle bodies usually goes a long way toward improving things. Adjusting the fuel map is a popular fix but will raise the emissions which may or may not be a legal problem with dealers so many won't even mention the possibility.
The underpowered part is a different thing entirely but we need more details to get a better idea of what is going on. The usual suspect is the very lean condition the engine runs in for emissions reasons. The 2500-3500rpm range is usually the worst part of the problem. Keeping the revs up and getting a proper sync for the two throttle bodies usually goes a long way toward improving things. Adjusting the fuel map is a popular fix but will raise the emissions which may or may not be a legal problem with dealers so many won't even mention the possibility.