On higher mileage vehicles, one or more EGR orifice in the intake manifold may plug with sludge. This can cause the engine to misfire when first accelerating because too much exhaust gas is directed into the cylinders where the orifice is not plugged. Cleaning the clogged passages should correct this concern.Google+
Car Problem Reports
Ford F-150 EGR Orifice in Intake Manifold May Plug With Sludge and Cause Misfire
Ford F-150 Problem
Exhaust & Emissions Affected: 4.2L V6
Average Mileage: 97,812 mi (72,000 mi - 145,250 mi)
Visitor, 2010 Ford F-150, 145,250 mi
On acceleration even at higher speeds my truck truck balks and hesitates.
Visitor, 2008 Ford F-150, 72,000 mi
ENGINE MISFIRES WHEN COLD AND STARTING OFF AT LOW SPEED
Mechanic has said that he has never seen anything like what happened to my truck. I got a new radiator cause I was leaking antifreeze. It still kept leaking. Now the mechanic is saying it is my intake manifold and that there is some gunk inside it that he has never seen this happen. The fixing will be about six hundred plus dollars. I am trying to see if there was a recall or something that can help me with this problem.
slow to start and once started idles very ruff and with poor performance