i had installed a new engine(from heads down). my problem is that spark plugs 1,3,5,7 have normal wear. 2,4,6,8 have black spots like if the engine is running rich. i tried to find a vacuum leak but found none. can someone suggest a solution?
oh, and my mpg is 11.

 

Sounds like you have an injector hanging open / dripping.

Take the air cleaner off and turn the key on to get pressure,
look to see if one leaks.

 

i checked how you told me but the weird thing is that when i put the key forward the fuel pressure guage does not show any pressure. it shows pressure until i start the engine. i cant figure out why it does that.

 

Did you "T" the line or did you "dead head" the pump?

 

i used one of these.
http://cgi.ebay.com/ebaymotors/GM-TB...mZ250400291439