Good day, and Happy Holidays to all.

While driving at normal speeds, my 1995 coupe, AT, 46K miles, began sputtering and idling rough. I babied it home, while observing that the sputtering became intermittent. At first I thought bad gas, but the exhaust pipes are black and sooty - leading me to believe deeper problems exist.

The ALDL is a 16-pin. Today I pulled codes (per instructions on other Forum threads) and found:

Module 4: Code H-64
Module "A": Code H-24
Code H-61
Code H-62
The display then went into "1.0" and no other codes came up.

I have done nothing to the car yet.

Questions: 1. I could not find an "H-61" code for 1995, but codes from 1996 reflected a bad 02 sensor. This is consistent with an H-64 code, but why a separate code?

2. I could not find a module referenced as "A" but there were codes shown (?).

I have previously experienced speed surge when the cruise control is on, and I intend to check all vacuum lines. At the same time I have to replace valve cover gaskets, but prior to going deeper, I wanted to enlist this invaluable Corvette resource to elicit comments and experiences, and any recommendations you may have.

I am the second owner, and the car sat for a long time prior to my purchase about two years ago. But I have put about 3000 miles on it and I have never had a lick of problems with it prior to this incident. Yes, I do "get into it" sometimes, but never abusively. The car is pristine throughout.

Thanks in advance, Gary

 

Yes, I received a Code "H61" when I retrieved codes via the paperclip method. There is NOT a code 61 in ANY of my manuals, in any of the forum threads, or even in any of the "F" Body websites. Yes, I am sure of the number - even checked it twice (like Santa does his list). Does anyone have a clue?

Prior to struggling back to the garage, heavy black soot was coming out of the tailpipe and covering the entire rear of the car. I checked a few fittings and generally shined the flashlight around (like THAT was gonna help) . . . Now it runs fine.

C'mon guys/gals - someone has to know what's going on here . . . lol

Thanks, Gary