My 97 was cold starting with no problems this fall but now it is taking several cranks to get it to light. Usually it will almost catch on the first crank. When I continue to turn it over, white smoke comes out the exhaust. It also spews white smoke when it starts going. It doesn't run rough once it starts. I was going to ohm test the glow plugs and see if jumping the GPR would help out. Is there anything else that could be the culprit?