i have a 04 pontiac grand am 3.4L and i can't figure out why it is lacking power sometimes and…

JRO

i have a 04 pontiac grand am 3.4L and i can't figure out why it is lacking power sometimes and occasionally spits up antifreeze and gets a little over operating temps. i replaced the thermostat, fuel pressure regulator and O2 sensor bank 1, plugs and plug wires recently and the fans seem to kick on when they're supposed to except they seem to run in the winter when they don't need to be and keeps the coolant below operating temps. i keep getting the P0131 for the bank 1 02 sensor low volts on my scanner after i erase it. it did have multiple random misfire on a long trip so i replaced the plug wires and haven't had any more codes for that to come up but sometimes it seems to run decent except when you're pulling out onto the highway and have to gain some speed or at a incline when you have reached your speed and its lacking, thats where i get the P0131 code to come up most of the time. im coming at a loss into what direction i should go next. please help

Comments (3)
No. 1-3
JRO
JRO
JRO
JRO

ok thanks! ill try that test on my car and go from there

ScottyKilmer
ScottyKilmer
classic signs of a blowing head gasket, do this video test first https://www.youtube.com/watch?v=QA7KVQq9vKA