98 5.7 the miss is almost gone but im stuck...

[Black an tan Z71]

Alright guys, so a lil while back I fueled up my lifted gas hog an shortly after developed a miss. Tried running fuel cleaner thru it to no avail. Found out the pumps I got fuel from had a batch of bad fuel. Well I finally narrowed it down to my injectors, took off the top manifold an found the rear of the intake had fuel in it so I replaced my injectors with the mfi upgrade from napa. Drove it an wasn't still right.
Put a new set of a.c. delco plugs in since it was that time an i figured the bad injectors probably messed em up anyway. Now, when j drive the truck kinda stumbles leavin from a stop an when I get to 4k rpms she starts a bad misfire. Also power braking she breaks up on that load. Pretty much the truck drives fine when driven easily but any load an she breaks up. Also I just put a new distributor an fuel pump in a few months ago an I did check the fp an its still at 58 lbs at idle. Anyone got a idea?

 

[magimerlin]

Any engine light on by chance.. If you where dumping that much fuel to stay in the manifold you might have been running rich enough to kill the Of sensors..

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[Black an tan Z71]

Any engine light on by chance.. If you where dumping that much fuel to stay in the manifold you might have been running rich enough to kill the Of sensors..

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Yes but the only code I have had is a p 300 random misfire. An when the truck does misfire the cel will flash multiple times

 

[98_k1500]

If you have the means to do so, check the injector timing. Mine was showing -45° because the cam sensor in the distributor was not plugged in properly. one of the pins got bent over when i plugged it back up after the motor swap.

 

[Black an tan Z71]

If you have the means to do so, check the injector timing. Mine was showing -45° because the cam sensor in the distributor was not plugged in properly. one of the pins got bent over when i plugged it back up after the motor swap.

I think im gonna check the sensor at least. The timin was set professionally after I put the new distributor in but I had to unplug the sensor to get the fuel lines removed when I replaced the injectors. Part of me is thinkin I need a compression test because I did have some oil on my number 8 spark plug when I changed it..

 

[Black an tan Z71]

Ended up bein a bad dizzy cap an rotor. Junk napa parts. Put in a duramax gold cap an rotor an runs like she should now

 

[88 Z28 Guy]

I was just about to post saying check the dizzy. I had a reman one go out on me within 3 months. I believe the upper bearings on them are faulty. I chased around a slight misfire on my green truck for a while and finally found that the shaft would wiggle if u pulled it up but not if u pushed it down. So being that the dizzy shaft gets forced upward as rpms go up mine would only misfire under a load and a little during cruising.