Check the vacuum hoses for a leak.
2006 Chevy Impala LS 3.5L Surge Under Load - YouTube
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Jan 22, 2013 - Uploaded by Gary Castle, Jr
Surge while driving. ... 2006 Chevy Impala LS 3.5L Surge Under Load ... How To Fix Or Prevent Stalling, Surging Or Rough Idle, Cleaning ...
SOURCE: when apply throttle at full speed ,engine will
Sounds like e.g.r. valve is stuck and not fuctioning because of carbon build up, you will have to take off and clean, and clean inside intake where it bolts on, use a shop vac for that, also you can buy a screan gasget at any auto parts store to keep any particals you miss in intake from geting back into e.g.r. valve. this should cure both your problems.
hook a vacuum gauge to the intake manifold and, check for a vacuum leak in vacuum hoses and, fittings
SOURCE: 2006 Chevy Impala reduced engine power
best bet is to stop in at a Pep Boys, Autozone, or similar big autoparts seller, and ask for free trouble code scan, which should pinpoint area causing problem. If not obvious by codes, what is necessary to repair the problem code, get back to us with those codes and we will be glad to assist you further. Better this way, takes away the guess work, and saves you money, as well as getting it right the first time.
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