Hey guys I'm new to the site. Just picked up an 88 iroc 5.7 my issue is this. While cruising at 30+ mph, with my foot barely on the gas just maintaining speed there is a nasty miss. It almost feels like Im driving with a flat tire. I checked my flash codes I got a 23 and 33. I adjusted my tps and fixed a torn vaccum line then cleard the codes. The car runs more smooth overall but that miss is still there and quite annoying. Where do u guys think I should start? Thanx for your help

 

Also another thing I did was a resistance check on my fuel injectors. They all read 18 ohms. Does that seem high enough to require replacement? My repair manual says they should be at 11 to 14 ohms.

 

The injectors need to be higher than 16, and all within .5 of each other. If they arent within .5 theres a problem. Have you replaced fuel filter?

Did the codes come back or no?

 

Codes have not come back. Replacing the fuel filter is not a bad idea. I will give that a try. Code 53 came up though. High voltage. I changed my alternator hopefully that does the trick.

 

When you checked resistance on the injectors did you check them when they were hot and cold?? Ohm readings for the stock multecs should be approx 16.0 ohm.... and as Black88z said, within .5
They coils have a tendency to fail when they are hot

 

The car wasn't completely cold I drove it maybe 2 hours before testing. Ill try to warm it up then check