Blazer 5/26/2010Just a suggestion.
Have the back flow / pressure of the vehicle's exhaust checked.
Some exhaust shops here doesn't charge to just check it.
I see you've replaced numerous parts. Wow!
restbiz 5/28/2010The old chevy also is missing at idle and uses huge quantities of gas. The exhaust seems normal but I will have a muffler shop check it on Saturday. Does anyone have a diagram of the vacuum lines and injection system. Also there is just a hose from the intake to the valve cover with no PCV valve. In fact the correct PCV valve would not even fit.
Blazer 5/29/2010A few pcv's on some vehicles were mounted in the intake manifold with a rubber grommet, most located in intakes rarely were changed because most people always looked at the valve covers rather than intake & when replaced either the vacuum hose was worned & leaking & or were usually clogged.
A good vehicle repair manual might show where.
Assuming the vehicle's accelerator cable isn't restricted in movement under hood.
You might also run a dry & wet engine compression test.
Check & or adjust engine timing.
restbiz 6/1/2010I checked the catalytic converter and the muffler shop said it was OK. It is very rich and runs better when cold. It loses power going up hills. I also found the PCV valve buried in the rear valve cover and changed it. I also cleaned the throttle body with the correct cleaner, with no improvement. Any Ideas out there.
Blazer 6/1/2010Only idea at the moment & without seeing it you might check for any possible engine trouble. Perhaps scan for any hard trouble codes.