What is the meaning of diagnostic codes P200A VCM Performance and TSB Engine 101?

Why -ve terimal of the battery is grounded in vehicles? Is it best to drop the fuel tank or lift the truck bed in replacing the fuel tank on a 1998 dodge Dakota? Where is the cabin air filter located on a 2010 Chevrolet Equinox LT wwith a 2.4L engine? What can you do if your catalytic converter is plugged? How do you change the transmission fluid in a 98 Saturn SL1 Automatic? What are lights on dash that stay on? Replace abs sensor on a 2006 Toyota RAV4? Who makes fram ph8170? How do you remove 2002 oldmobile 3.4 liter fuel pressure regulator? What is the firing order of a 1956 Plymouth 6-cylinder engine? Were is the fuel filter located at on a 1989 ford bronco? When driving down the road my gages will just stop and go up and down It doesn't loose any power but when your driving and see your gas speedometer and RPM gages go dead.It worries me driving it? What is the meaning of a red triangle? How do you change transmission filter on 1997 Ford Contour? What is the fram oil filter cross reference for a purolater pl14670? Firing order on the distributor for 302? What is the firing order for a 1989 Chevy calalier? How much horspower will a cold air intake give a LT1 Camero? What affects braking distances? How do you replace the power steering belt in my 2003 Mitsubishi eclipse spider GTS 3.0L i need diagram and specific detail instructions please. doing it by myself and I am a women with not much exper?