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Roy, import/domestic specialest
Category: Chevy
Satisfied Customers: 5130
Experience:  ASE master tech for 40 years
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When engine is cool it runs ok but after warmed up it boggs,

Customer Question

When engine is cool it runs ok but after warmed up it boggs, bucks and have to keep RPMs up. has new engine coolant temp. sensor and has not fixed the problem. 4.3 L Vortec 1994 Blazer.
JA: Which particular sensor are you asking about? And have any trouble codes been triggered?
Customer: The oxygen sensor. And yes.
JA: Are you fixing your Blazer yourself? What have you tried so far?
Customer: The new coolant temp sensor.
JA: Anything else you want the mechanic to know before I connect you?
Customer: no.
Submitted: 5 months ago.
Category: Chevy
Expert:  Roy replied 5 months ago.

good afternoon my name is ***** ***** I will assist

how old are the plugs???

I would start by checking the fuel pressure from the fuel pump.