Backsparkplugs remplaising sparkplus in a venture 1998

backfire usually means the housing where the sparkplus plug into is cracked and has moisture in it.

You can remove the engine struts(dog bones) mounted over the top of the radiator. Use a ratchet strap, attach one end to the engine hook on the driver's side dog bone mount and the other to the radiator support. Pull the engine forward, you can then access the rear spark plugs. You have to make sure your spark plug wires and ignition coils are not corroded also.

it does not have one......what is the complaint??

battery is dead or too much corrosion on the terminals.

check the throttle position sensor and also check for air intake leaks at the throttle body

It sounds like the switch went out. I have seen a lot of GM products have this same problem.

it sounds like you just have too much oil in there to begin with. I'm unsure on how the valve cover gasket would affect the spark plugs in this case.

This means that you need to Replace the Catalytic Converter. Please Rate My Response! Thanks!

Never less than about 10lbs.usually 30lbs or so  If less then either engine main bearings is badly worn or  or the relief valve inside the oil pump is stuck in the bipass mode.

it may be the harmonic balancer