97 Jimmy No Power under load

[pags20]

Help,
When I step on the gas nothing happens as if no fuel. As engine warms up a little it will gradually start going. This only happens under load,sitting still engine revs no problem. I new my catalytic converter was shot and replaced that along with both O2 sensors while I had it apart. Still have same power issue. Also the Check engine lite is on,this lasts about a week then goes off but as of rt now it is on? Any help!! pags20

[MT-2500]

Originally Posted by pags20

Help,
When I step on the gas nothing happens as if no fuel. As engine warms up a little it will gradually start going. This only happens under load,sitting still engine revs no problem. I new my catalytic converter was shot and replaced that along with both O2 sensors while I had it apart. Still have same power issue. Also the Check engine lite is on,this lasts about a week then goes off but as of rt now it is on? Any help!! pags20

Get it scanned and post back code no.

How is the fuel pressure?
What is engine vacuum at idle and at 2K rpm?

How is tune up end?