Hey folks have been reading many posts, here is my query. 94 s-10 trailblazer sat for 2 years, Father was to build a rodster out of it but age outlived ambition. God Bless Him. I decided to put the truck on the road however ran in to many of problems. To make a long story short, Crank but no start. My mechanic diagnosed it as a bad CPI, replaced 2 days later Crank but no start, Mechanic then replace fuel pump along with the filters ect. 2 days later Crank but no start. Mechanic said it was a bad fuel pump, replaced again . 7 days later truck runs rough,gas smell and smoke on start up from exhaust. Been reading forum what I can gather is possible catalytic converter or egr valve. Truck runs rough on idle and accelleration drags, truck seems to run soso at higher speeds. Is their any way to know for sure what the cause may be, any help would be much appreciated, running out of faith, the truck was tuned up b4 all the mechanical stuff expalined above.Will keep reading forum. 123000 mile 2wd, cpi 4.3 Thanks for any reply...

Check the nut kit.

Also clean and reinstall your EGR valve with a new EGR valve gasket.

Check the nut kit.

Also clean and reinstall your EGR valve with a new EGR valve gasket.
Thanks LT, I have been reading more about the design issues with the egr, hear thiers a tomco gasket with screen will try . Thanks again...

I don't recommend the screen seeing you want the carbon out of your system, not trapped in there.