This happened to me in Napa in 114 degrees wih my pets in the car several years ago and I think its happening again. I need to find how to get it off and I found the part for $159.00 or I need to find out how to clean it. It costed $500.00 + on the road, boy they saw me coming!!!
between 30 and 40 miles per hour the vehicle seemed to shake. would not exceed above 66 mph without shaking. opened doghouse and pumped the ERG valve by hand. Would depress easy . Motor started hard after an overnight sit but ran better all though leaving a high idle.
Driving along when all of a sudden my van wants to die, the idle is rough. I have to feather the pedal to keep the engine from stalling and shutting down at every intersection. I thought it was the battery, but t'was not the problem. Was told maybe the Catalytic converter. Exhaust system check revealed nothing. Van running smoothly for 2 weeks until the problem occurred again. Brought Van to the GMC Dealership. Scan revealed problem with EGR. GMC Servicewriter told me EGR was bad, and need to be replaced. I wasn't told it could be cleaned. EGR was replaced. No problem driving home. The following morning driving to the store,the problem started again. I returned my van to the GMC and told the Servicewriter of the same EGR problem. They repaired the EGR problem of removing carbon deposits in EGR exhaust system. Servicewriter phoned me my van is GOOD TO GO. So far, no problems driving home and elswhere today. I will observe for re occurance.