Cold start problems

[VirtualExplorer]

I got a 91 xlt 5 speed V6

The problem that I'm having is when i try to start my truck in the morrning
when i turn the key it cranks over of about 2sec then it pauses then cranks for another 2sec then starts.

I got a new battery(plus terminals)
new battery cable to the starter
fuel pump
fuel filter
fuel pump rely
new starter 1 year ago

Can anyone help me diagnose this problem

one other thing....It only does this when i first start it in the mornings cold start. after it starts it dosn't do it again...intill the morning?

 

[TPLYNCH]

Replace the negative cable too.

 

[VirtualExplorer]

Can having thick oil in my truck cause this problem???

I currentlly have mobil 1 5w 50 synthetic

the weather here is about -10 *C right now

 

[VirtualExplorer]

Fixed the problem

well i fixed the problem

the oil that i had in the engine was too thick so i went with 5w 30 syn
also changed the plugs and air filter
the truck starts up great
thanx