The car is showing a miss on the #5 cylinder, occurs only when engine is
under boost from the supercharger. Occasionally also shows miss on #4 and
less frequently on #6. This was found by using a scan tool.

Have swapped plugs, wires, injectors, injector wires, and coils with those
from either #3 or #1 cylinder, but problem stays on #5. Also tried a new
ignition control module. Engine runs smooth in the driveway at all rpms.
Only misses under load and only under boost conditions.

I'm thinking fuel pressure regulator?? fuel pump??

The fuel filter was recently replaced. I run 92/93 octane.

Problem occured after car was parked for several months with only being
started every couple of weeks and idling to operating temp. The car has
177,000 miles. Ran great before parking it.

Any help would be greatly appreciated.

Thanks,
Jeff

Jeff & Carol wrote:
Could be the injector is sticking, gummed up, or failing. Either borrow or
buy a Noid Light Set. http://www.sjdiscounttools.com/ta36330.html Load or
boost conditions would require more fuel than idle causing a poorly
performing injector to only cause a problem then. Buy some test equipment.
In the long run it's cheaper than just throwing new parts at it and hoping
to fix it.

Thanks for your response FBR.

Am I mistaken to think swapping the injector with one from a cylinder that
is performing well is good enough to prove it is not an injector problem?

Look and see if that cylinder is the last one on the fuel rail. If it is, it
may be the one that is becoming starved for fuel.

"Jeff & Carol" <jcarter6 (AT) cableone (DOT) net> wrote