1995 Chevy Caprice intake backfire

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Inbox : Message
From: 9clt1
To: rasmataz
Posted: Sun Dec 23, 2007 11:25 pm
Subject: air filter back fire
i have replaced plugs, opti spark, mass air flow, computor, and o2 sensors, fuel filter but still have a back fire comming from the intake air filter. Intake bolts are tight, exhast is tight. This hapens at a high rpm. Also idels rough and has no power like a lt1 should. The drivers side old plugs were BLACK but passengers side were good. I do see some improvement since the opti and plugs were changed but still that darn back fire from the air filter is still there. Could the cat be bad. No check engin light on.
1995 chevy caprice. LT1. 9C1. 5.7L
122.500 miles
HELP!

Could be a problem with excessively rich or lean mixture. Sparkplugs with wrong heat range, excessive carbon/hot valves and Ignition timing

Also have the throttle position sensor and fuel pressure check-look for vacuum leak