What would cause occasional abrupt engine miss in a 1994 Suburban 350-getting worse and occurs when the engine is warm-nothing shows up when dealer tested-changed fuel filter rotor cap and coil wire?

Answer 1

Intermittent problems are the worst kind. You can't find them unless they're being a problem when you're looking for them. That never happens of course. My first guess would be a bad connection somewhere. I'd check all the wires under the hood for any breaks, cuts, or tears that might be shorting out. I'd also wiggle and push together any wire connectors you can find in the hope that one of them might be a little loose or something. note: If this works you may never know exactly what the problem was but as long as it quitsa... who cares right. If none of the above works you may have to wait until it gets really bad or even quits running to locate the problem. Unfortuinately, that's the nature of the beast these days. Everything's computerized and if the diagnostics equipment at the dealer can't even find the problem... you might just have to wait. Oh, you could take it some place else and have them check it. You might get lucky, who knows. I had the same problem with my '94 it seems more like it would bog down with no apparent reason and my mechanic could never get it to act up for him after several tries. It ended up being a bad computer. Cost $166 including labor to fix. Hope this helps.