Auto Parts: Toyota Tacoma turn over issue, air flow meter, coolant temp

Question
i have a 2003 toyota tacoma, and sometimes when i try to turn it over it struggles.  I know its not the battery or starter and it only happens on hot days.  do you think if i changed the fuel filter and the spark plugs and spark plug wires that this would fix this problem?

Answer
    You say that you know it's not the battery or the starter.  Is that because you have replaced both of them?  And, does it crank slow or just not start right away?  Battery performance is lower at higher temperatures as is the performance of the electric starter motor.  The engine can also be harder to crank on hot days, especially if it has been run recently and had a chance to soak in its own heat for a while.  If it is a cranking problem, I would recommend replacing the battery cables, both of them.  And, I would recommend shelling out the cash for the original ones from the Toyota dealer.  Toyota cables, especially the positive one, are very complicated and trying to make a universal one from Pep Boys work is really not worth the effort, trust me.
    If it's starting when hot that's a problem, and this can certainly make the starter labor as the engine is designed to start right away (I once had a 12 cylinder Jag that started after about half a turn and idled so quiet you could balance a penny on the intake manifold, otherwise a nightmare to own).  Fuel injected cars have trouble starting for two reasons: an injector or more than one is leaking fuel into the intake manifold when shut off, creating an over-rich condition, or: the coolant temp sensor is telling the computer that the engine is cold when it is really hot, also creating an over-rich condition (get someone to scan the computer for a wonky sensor).  A leak in the air intake aft of the air-flow meter could also do it, but that truck is too new for that stuff to have gotten old and disintegrated.