1989 toyota pickup misfires

[rlfii76f]

My truck has a misfire when I slightly back off the gas. It has a 22re, carberated. If anyone knows what it might be I would appreciate any feedback. Thanks

[natenelsen]

hmm I thought -e's were injected and -r's were carbed, Maybe someone else can elaborate.
Has there been any work done on it lately?

Look for exhaust leaks first, then check for a vaccum leak at the hoses and at the gaskets (manifold, carb base ect.) be sure your ignition system is up to spec (plugs good, wires/cap/rotor in good shape) and check that your timing is on. If timing appears off, I would look carefully at the timing chain, especially if it has never been replaced. Do you hear a rattle or clicking type sound from the front of the motor?

That should give you a start, any one else?
Let us know how you do and keep us updated.

Nate

[rlfii76f]

Sorry it is an R. Typed the wrong thing, I just bought the truck, when I first got it, I replaced the Plugs, cap, Rotor button and wires. I have sprayed the vacume hoses down with carb cleaner to check for leaks. The only place I am wondering about is the EGR valve, cant really tell if it is getting air there or not. It runs great other than the little miss when you slightly lift the throttle. The temperature guage stays right where it is supposed to. It just feels like it stops getting fuel or fire for a second when you lift the throttle. Thanks Richard

[natenelsen]

re egr:
disconnect the vaccum to the egr and plug it, then check for the misfire, if it is still there use a vaccum pump/gauge and apply vaccum to the egr valve making it open, any change in the way the engine runs? And I would still check the timing, a loose chain(broken timing chain guides are a strong possibility in these motors) will cause the *valve* timing to shift around, and this could be the cause of a misfire like you describe. Oh yeah, a breif description of what the vaccum gauge does at idle and when the engine skips could also be helpful. If everything seems okay, do a compression check in all four holes.