Hey guys. I have a 2002 chevy blazer 4.3l v6. My coolant temp gauge will randomly go 2 lines after 210 and if u drive for 3 seconds it goes back to the line before 210... my volt meter will someti.es read 16 volts then go back to 14.5.... my oil pressure will only go to the line after 40 cold start in 20-30* weather and as it warms up it drops to about 19-20 psi but as soon as u touch the gas it goes to 40 and remai s there untill u go to idle again. My gas gauge will randomly drop to E while driving and if u stop and shut the vehicle down and restart it goes back to correct reading. Ive heard the stepper motors fail alot. What does it sound like to you? Ive already replaced oil pressure sending unit.. I do my oil changes ever 2000-2500 miles and run syn blend 10w30 with fram filter. And also if u take key out of ign and just sit there with car off not touching anything the temp gauge and gas gauge will go straigt up so 1/2 tank and 210* and at night I notice the P and the milage is slightly lit up without the key in ign. What the heck is going on here?