I need to replace an engine 4.3 liter vortec v6 in a 2002 chevy silverado 1500 pickup. I need to know what year model will fit in my truck. Help! lg3 lu??

Your question would be better with 'year make model'.

Help and videos in the link

https://www.google.com/search?q=4.3+liter+vortec+replace+oil+pump

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year make model 4.3 oil pump replacement

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https://www.google.com/search?q=2007+Chevy+Silverado+2500+HD.+TCM+location

Diagrams and videos in the link

The actual engine would be close to the same if the year and engine size are. It would depend on the difference in year and size for the components. A salvage yard would be able to tell you for sure.

i am assumming that your engine is a 5.0 or a 5.7 liter engine.this is the most common used in the chevy pickup.this means "if" it has a distributor it will be located at the rear of the engine.BUT it could also be "dis" ignition or "cop" type ignition. dis is distributorless and cop is coil on plug type ignition

the knock sensor is back beside the base of the distributor.

Here is a detailed how to, its on a 2000 but it should be the same.

http://www.saltedwound.com/archives/2008/08/25/changing-a-fuel-pressure-regulator-on-hard-starting-2000-chevy-silverado-yourself/

Here is a schematic of your engine layout and the firing order.

Firing order:- 1-8-7-2-6-5-4-3

1999 chevy 1500 series has spark getting fuel wont start replaced crank position sensor cap n rotor getting backfire through throttle body.

third back pass side the coil is probably bad if you have a miss code common problem

Hello, it seems that you have intake gaskets leaking. I'll bet you have the vortec 350. This is a common problem with the vortec, Gm uses plastic intake gaskets and they blow out over time usually to the externally but yours is internally.It is a pretty easy fix for the average mechanic to do. Thank you