2001 silverado, trouble with power at high speeds. changed fuel filter, it helped, could it be the injectors?

The truck is lagging bad on hills, and at higher speeds. The truck does not increase speed gradually, it down shifts hard and slows and chugs on hills. around town it runs great, no problems. I did just change the fuel filter and it helped, but did not completely resolve the problem. Could the problem be dirty or clogged fuel injectors? The truck has 117,000 miles on it.|||Yes it could need a fuel cleaner used for injectors but also there is a gas regulator that could be causing it and it could be a fuel pump even.Try using a injector cleaner and also change the fuel regulator and if that helps to fix it , later change the fuel filter again after a few tanks of gas.


You didn%26#039;t say you had checked the spark plugs or cleaned and regapped them or cleaned the spark plug wire connectors and ignition coil contacts so I suggest you try that too.





Hope that helps and best of luck. By the way you might want to have a free scan run on that vehicle too to see if any codes appear involving this problem.|||Your quite welcome , I too like the older vehicles and please keep me up to date even if it%26#039;s another question with a update thanks.

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|||Does the truck have a hard time at higher engine rpm? Might be bad air flow, dirty air filter, clogged cat, or pinched exhaust.





Also do the norm: air filter, plugs should have been done at 100k and check the gap I think they are .060%26quot; on your truck but not positive. You don%26#039;t have plug wires, individual coils... The fuel filter was a good move.





If the truck is actually chugging, it would be fuel delivery. Could be a bad injector, either dripping fuel or not spraying a pattern (clogged)





If the check engine light isn%26#039;t on, there there isn%26#039;t a code to view.