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Did you disturb the injectors at all, or try to clean them? I created a misfire by cleaning injectors when I did an upper intake gasket in a 3100.

You need to determine if this is ignition, vacuum or fuel related... that will be the first step. A leaky intake manifold gasket can cause it, a crack, injector, cross talk between the injector wires and the ignition wires, improperly routed ignition wires...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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