Acura mdx 2012 - persistent slow start of the engine; engine is straining to turn over/start. i have replaced the battery 4 times, checked all possible problems (starter, spark plugs etc.) but same random, periodic problem of the engine struggling to start. related problem: fuel tank appears to be somewhat loose; when i buy gasoline, i can see the gas tank move. in addition, it is difficult to fill up the car with gas; the gas pump cuts off before the gas tank is to the "full" level. my gut tells me that these 2 problems are somehow affecting my car starting. my car has only 51,000 miles on it. i take good care/maintain it. i have read others complaining about the same problem!!! acura should fix this! too expensive of a car; where is the quality??? this is an ongoing problem of my 2012 acura mdx . please help.