I have 92 ford ranger 3.0. when i start when its cold and put it in drive and go it wants to quit and sometimes it does. but when its warm i have no problems. when its cold i have to ease into the gas so it wont quit.... and 2nd problem is my voltage meter on dash is reading higher than normal volts. engine shakes sometimes. and clue what to check/ do. any help would be greatly appreciated.