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Here is one for you….
2000 for 4.0 L. 198,000 kms yes canadian truck ! Out of the blue went to start the truck in tne morning it was about 10 degrees and crank but no start .it had a couple stumbles but that was it.
Tried again and as it was turning over tried WOT and boom started up.Tried same process and same result .wpuld only start on WOT.
Let run and warm up and no problems starting .started right up .only thing i noticed it would idol low and some times stall but woild start right back up .this only happened a couple times.pulled it in the shop ,serviced TB,plugs are newish,and fuel pressure at 63 PSI and holds .same pressure when running cold or hot.
Tried priming pump a few cycles 3 times before starting but does not help.no engine lite on nor has it ever come on .
Again when it’s warm no problems .only when cold
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