I took my 2000 blazer to the dealership for a leak was told the intake was leaking so I told them to fix it for $875. Three days later they called and said my car had a miss in it #4, they said the spider was not getting gas to #4 they put in some stuff to clean it out but nothing worked, now 9 days later they want to install a new spider and charged me another $700. Why did the spider get plugged up.

 

Not sure,but i hope you know you could of got this work done much cheaper elsewhere.

 

If number 4 was not plugged before they removed the lim they could have disloged crap by moving the hose to 4 around. If they didnt test #4 before hand thats prolly what happened. Their fault. If they did check it beforehand you at least need the redundant labour deducted.

 

Yes I know that I can get this done cheaper but I take both my cars to this dealer.

 

They must LOVE you......
Doggy style

 

The problem with your Spider could likely be the Fuel regulator unit within - attached to the Spider Unit assembly under the MPI Cover.

You could get by with alot less outlay possibly by purchasing only the
Fuel Regulator unit ( Round Cylinder Unit approx. 1 inch in diameter
and 2 in. length ).
General Auto Parts stores can usually special order these type Fuel Regulators, as they are seldom normal stock item.
If I were in your situation I would DIY only this unit first then go ftom there !