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Pinching the return line wont hurt anything, it will richen the afr up a little and could point you in the right direction.I'd also suggest taking it to a dealer or an aftermarket shop with a good reputation.And Glenn dealerships have intelligent, certified tech's that will be able to figure this problem out gauranteed. Some aftermarket shops do to, but some would be throwing parts at it just like he is.
Pinching the return line wont hurt anything, it will richen the afr up a little and could point you in the right direction.
I'd also suggest taking it to a dealer or an aftermarket shop with a good reputation.
And Glenn dealerships have intelligent, certified tech's that will be able to figure this problem out gauranteed. Some aftermarket shops do to, but some would be throwing parts at it just like he is.