I've got a 1995 blazer 4wd with the 4.3 vortec. I have never had this problem before. What i've got going on is a really harsh stumble when you give it gas usually after turning a corner or on or off the interstate. Its bad enough that it wont gain speed. This is very intermittent. I drove it last about 30 miles and it ran like a top. I took one corner hit the gas and bam! it does it. Please help me! I love my blaze and I need her 100 percent.

 

The only thing I can think of is maybe if you're real low on gas and sucking air.