Hard crank, won't continue running

[GaryM]

Hi, new here. 2012 150K Mazda5. Ran great in December when parked for winter. Very hard to crank now. Replaced starter with no improvement. I found a rubber part lying on the-under cover near the oil filter - it looks like part of a mount. I replaced the starter from the top so have not taken that cover off yet and can't see up from below (the car is parked on a block of ice). I did start it in January, and spun the tires trying to move it. Thanks in advance for any thoughts. Gary

 

[GaryM]

The rubber piece appears to be packaging from the belt tensioner replacement last year. My bad. The engine fires but no acceleration until stall