Need to know how to remove the three back spark plugs from a 1997 chevy venture minivan ? what do i take off?

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For strangeness like that you need a mobile auto electrician with a pro grade scan tool computer. It can record exactly what happens when it cuts out.

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you may have to put on lift or jack it up to get to plugs.

there is a drain plug on the bottom of the oil pan you remove to drain the oil its ether a 15mm or 14mm wrench while the oil pan is draining out unscrew the filter apply a thin coating of oil on the gasket of the new filter make sure the gasket from the old filter didn't stick to the engine install the drain plug and new filter add 4 quarts of new oil and run the car recheck for leaks and oil level that one holds 4 quarts or 4 and half not sure but 4 will be safe to start the engine

The generic answer is "in the cylinder head".

A 2001 is only equipped with a 3.4L VIN code "E" V-6 engine. This engine is equipped with a three-coil ignition system with plug wires running from each of the coils to two of the 6 cylinders. There are 3 cylinders on the right bank (the side closest to the driver) and three cylinders on the left bank (the side closest to the radiator).

you will have to swap the electronics from the old engine to the new, if the intakes are different the will have to be swapped, best way to go

those are a pain to do, there should be either 1 or 2 wishbones going from the top of the engine to the radiator support at the front, remove them and put a ratchet strap from the alternator bracket to the radiator support and crank the engine forward. Be sure to do it on a cold engine as you will be working right next to the manifold. The center cylinder isn't too bad but the other 2 are more by feel than sight. be sure to use anti sieze on the plug threads and be very careful not to crossthread the new plugs.

If you remove the bolts that hold the mounts at the upper radiator you can take a wratchet strap and pull the motor towards the radiator. Then go inside vehicle and set parking brake to keep engine from rolling back and then you can get to the back three plugs. They are still a challeng but it can be done. Thats why the dealer charges so much.

yes if it didn`t do it before you replaced with the different plugs