we replaced my 1996 Chevy Silverado 4x4 truck engine with a new crate long block

we replaced my 1996 Chevy Silverado 4x4 truck engine with a new crate long block. everything went together but when we went to start it it acted up. we
put the new engine together with new spark plugs, wires, cap and rotar. New water pump and air filter. tested the fuel pump was at 65 when we first started it up but would drop to 0. So we replaced the fuel pump. put 2 bottles of sea foam in it and its only running on four cyl. tested the spark all have spark. the only thing we can think of is the spider is bad? or the injectors are cloged? Help Please.
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On 7/18/2013 6:18 PM, Angela Mac wrote:

Help Please.

There is a sequence of events when it starts. Somewhere along the line, the voltage drops to the pump because of another problem.
I have seen this before, and someone will respond soon with what it is. Maybe oil pressure sender, or something like that.
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replying to bilb2765 , Angela Mac wrote:

We replaced fuel pump. So all good on that now she wants to run at 2500 RPM (we are looking for a vacuumed leak). But the only thing we haven't done is replace the injectors or spider. Only running on 4 cyl
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On 7/20/2013 1:18 AM, Angela Mac wrote:

How do you know only four cylinders?
Can you check spark on each at plug end?
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replying to bilb2765 , Angela Mac wrote:

Because after initial start and run for a min you take a old empty windex spray bottle fill it with water n spray the exhaust manifold an only four of them instantly evaporate. Hence no heat so not running. It's a pretty neat trick. An yes we tested each plug for spark. All are working. Found a local that has another spider we may just replace the whole top end. We were wishing someone had a simple answer or idea.
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On 7/22/2013 12:18 AM, Angela Mac wrote:

I like the spray bottle idea. Sorry I have no ideas. Spider could be the problem, but if it works to begin with, wonder why it would just stop. How about ground connections? Maybe the vibrations of the engine running is causing intermittent connections.
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replying to bilb2765 , Angela Mac wrote:

All connections are good. Found some unfavorable items in the fuel tank when we replaced the fuel pump so we are figuring injectors. I have really classy neighbors in my neck of the woods so by unfavorable I mean hose pieces, 3 ft of garden hose. A piece of wire. Etc. my mechanic is my Dad he's been at this for round 50 + years, owns his own shop/business. But this ole girl threw him a curve ball. Just wondered if anyone out there knew a trick to our Delma!
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