why do the spark plugs keep blowing out on my mazda e2000 van any ideas

Probably because they are too loose, torque them up correctly.

Hi without much detail it sounds like your threads have worn on your engine block, If you go to a engineering shop you can buy a heli coil kit and this would solve the problem

what do you mean by ''blowing out''?.do you mean blowing out of the holes?.in which case the threads are stripped and/or wrong type for that car ie too small?.or blowing out meaning not working for too long?.in which case youre engine may be worn and oiling them up.?

The threads in the cylinder head are worn ,you will need to fit a recondition head .
l hope this helps you.

There is a 'thread-chaser' for your size of plug, you wind it in like a bolt, and it cleans and refreshes the thread. Do be gentle with it though. Otherwise, you may need some work done on that head, or a better one.

most the tread worn out, your spark plug are wrong sizes.
if you thinking buying heli coil kit some people good and save tons of money how about the future.it will lose again and again more problem BUT for common sense, the Safety is the most important
buying cylinder head and has warranty. your feeling is like you own the road