2.7 3RZ rough start any suggestions?

my 04 2.7l 3rz seem to be having a hard time turning over.
this morning was the first time its happened and its also been the first morning ive started it when the temperature was below freezing 28 degrees.




anyone have any thoughts as to what the cause may be?

 

battery--first thought

 

What he said. Check the battery. Only time mine had a hard start in the cold that wasn't battery related, was because it was -30F outside. Oil was probably sludge.

 

thanks for the speedy responses guys.
I picked up some new plugs and if doesn't help any ill pick up a battery tmrw

 

Low battery
high resistance in cables
starter internal solenoid problems
incorrect viscosity oil can also cause slow cranking when it is very cold.

 

just recently changed the oil. used 5w-30 Pennzoil high milage

 

FIXED??? what did you find??