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short and long term mixture weak 850 1994

Howdy BB'ers
I'm having trouble with acceleration and the check engine light comes on with the codes for short and long term mixture weak. I have recently tried changing the fuel filter and replacing all the ignition parts....no help. I use chevron prem fuel and occasionally their injection cleaner. should I try and measurre the fuel pressure some where to see if the pump is working? I have an ultrasonic bath where I work does anyone think cleaning the injectors might help? I have 70K miles on her.
Thanks, Timbob






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