Why does my Chevrolet Blazer misfire when load on engine(acceleration or uphill) on 1995 Chevrolet Blazer

Car has been used heavily in last year due to job commute. Had an oil pan leak that was repaired in August 2012 as the mechanic said it was caused by a "striped" oil plug. Instead of changing the oil pan, he welded a new "nut" that fit another plug. Oil change in February 2013, Service engine light came on during commute trip home. (32 miles) Took it back for tune up (new plugs and wires) Engine is now "ticking" loudly when idle and also misfireing (jerking) when going up any small grade change in hwy and obvious when accelerating or going up hills. Had fuel pressure checked and mechanic said it was at "65". I asked that he change out the fuel filter and he said it didn't need to be done. ?

by in Tacoma, WA on May 13, 2013
2 answers 2 comments
ANSWER by on May 13, 2013
hi, i am having the exact problem you are having. i scanned mine and it came up a secondary air injection system which some blazers came with and some did not. i also know that these engines have an issue with the distributor shaft as well. when i find out more info, i'll let you know.
COMMENT by on May 14, 2013
Thanks. appreciate that.
ANSWER by on May 13, 2013
And the trouble codes are???
COMMENT by on May 14, 2013
I'll get back to you on that. . . Taking it to mechanic for diagnostics on Friday am.

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