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You need to try and do some basic troubleshooting then?
Eliminate ignition (spark) first, since this is the easiest.
First, confirm all 4 spark plugs are firing.
Then, confirm (with a timing gun) that they are firing at the proper moment.
If ignition system looks good, move onto the fuel...
I would swap the fuel injectors just as a test - does the problem change?
Swap either front to back (primaries) or swap primaries for secondaries.
Also, might want to check spray pattern from the primaries by tying the fuel injectors to the rail and crank the engine with the injectors out of their holes - helps to have a friend here.
-Ted
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