1998 Chevy 350 misfire

Have a 198 Chevy 4x4 with 350 and automatic. Snap On Solus unit shows code 300 - random missfires on cylinders 3,5 & 7. Replaced plugs wires and have
had fuel injection cleaning performed by dealer - motor is now periodically hard to start - but not always - and blubbers just above idle as if it is running rich? The missfires went away after the cleaning but the hard starting and blubbering leading to cold stalling are not the answer - please help.
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Should be scanned to look at what the temp sensor says for temperature starting from cold to warm up. Look for fuel trims trying to lean the engine down, possible the fuel press. regulator is bad, any reason excess fuel is entering the engine, lots of possibilities here, this may not be a dyer type. If it is that rich there should be other codes, a MAF can get contaminated ,the cfpi units can be troublesome if that is the type of fi on that engine.

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"jclockard" wrote:

shows
it
Have you checked the fuel pressure and the filter?
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Both Shep and SnoMan (as well as dealer from the sounds of it) ignored the fact that the misses are all on the same bank of the engine, indicating that it is not a problem with the entire system, just on that bank of the engine.
What did the plugs look like from that bank of the engine?
Doc
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Doc, p0300 is random misfire this does not indicate any cylinder, that would be 0305 or 0307, based on the 0300 I replied as stated, he never said he got 0305 or 0303, 0307.

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Shep wrote:

So basically you don't know what cylinder misfiring. What would cause a cylinder still misfire if you have changed Wires, Plugs, Coil, Fuel Pum, Distrubutor Cap and Air filter?
Thanks
ProTurbo 1998 Chevy Truck V6
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Shep wrote:

So basically you don't know what cylinder misfiring. What would cause a cylinder still misfire if you have changed Wires, Plugs, Coil, Fuel Pum, Distributor Cap and Air filter?
Thanks
ProTurbo 1998 Chevy Truck V6
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