THE MASTER 1

As long as im driving on the streets im fine.....when i hit the highway cruising at 55,60,65 mph etc..... Sumtimes when i nail it....its tends to bog...then it'll catch, then sumtimes it will bog again...then catch an go....otherwords may bog once and go or maybe twice and go....then runs strong....its a 2002 z28....all stock wit 136,000 on tha clock....any ideas??????

tyler.m.13

Could be a fuel issue. Maybe a fuel pump or fuel pressure regulator.

JM0523

Try a different gas station, maybe they got a bad batch, my car did this til i switched gas stations.

Sales4@Texas-Speed

iTrader: (4)

Are any SES light popping up? You might also check your front O2 sensors and make sure they aren't fouled out. The car will act like what you are describing if those sensors aren't in good working order.

blue98Z

iTrader: (29)

Fuel filter still stock as well?

chi-town hustler

I've tried different gas, fuel filter is stock and new........but yes ses light is on now and the code was po 0430 and I changed the pass.02 dwnstream sensor, cleared light and two days later, ses light back on......???????

sic2001

iTrader: (5)

Id say this is the same issue most are complaining about in different words. A vaccume leak from back behind the manifold usually shows a culprit. Strip back the coating and use a mirror or something to really get a good look, I missed mine for over a year from not stripping and throughly inspecting.