The thing is, you don't need anything that big or strong, or that draw so much current, and those are probably not rated for continuous operation.
The old original Mopar (sixpack) solenoids were not strong enough to "pop" a throttle up off idle, but rather popped out after you gave the thing a little bit of fuel. Remember too, that originally these were powered off the "ignition run" circuit, which ain't all that big a wire, and is NOT fused!!