P0300 Misfire on bank1 and bank 2 truck start but shut right back off.

Asked by Jun 28, 2017 at 11:55 PM about the 1996 Chevrolet C/K 1500 Silverado LB 4WD

Question type: Maintenance & Repair

My Chevey z71 4wdrive K1500, how can I test the
fuel injection and I was getting fuel pressure at
about 50 psi when my fuel pressure gage blew at
loose, know I got this P0300 code don't know
which way go since I replace wire distributor
pickup and plugs. Know I change one of plugs out
because I damage a older one I put in back in
November, trying to check the carbon on plugs.
Know it start but cut right back off as if it just lug
few seconds as if it's not getting fuel. What can I
do to fix this?

12 Answers


alrighty, when was the last time u did a full engine tune up? - spark plugs, spark igntions, gaskets (all of them), cylinder cleaning (the chambers) - and also - does it say dex-cool on your coolant tank? that is very important to note because if you mix say arctic freeze and dex-cool you will have coagulated mush inside your engine.


The Chevy vortec engine needs more than 60 psi fuel pressure. anything less and it wont run. 50 psi is too low. You will need a good gauge to check fuel pressure to be sure.

1 people found this helpful.
Best Answer Mark helpful

I know and thanks

I have change everything during the tun- up when I replace my lower intake gasket, plugs,wire new distributor assembly and coolant. That shitty as gm dex-cool ant worth cramp but have you replacing water pump, connector neck on intake etc. that's stuff is a bunch of crap. I did this tune up last year in November-December and I don't drive this truck ever day. But every since I replace the lower intake and change the coolant back to dex-cool from green I haven't had nothing but trouble with corrosion after flushing the green out. I think about after I find out the problem I'm going back with hotter plugs and keep ACdelco wires


P 300 is random misfire. Low fuel pressure will generate a p0300. But I have to ask. Did the code come up after changing the lower intake gasket? If so, I have seen lots of trouble with the plastic/rubber intake gaskets. If they are not torqued correctly and only to I think 20 Ft. Lbs. you will, I repeat WILL get a leak at the intake ports. if not now, sooner than later. Do you have a cam/crank correlation code as well?

2 people found this helpful.

No it come after about 9 months after my tun-up, it had been misfiring for about 2 weeks I took one of sparks plugs out today and broke the end of spark plug and replace it with the same kind and gap and it want really stay crank it just shut off and finally through a code then immediately P0300.

No It didn't show any other codes.


acdelco & felpro is what i use on my 2002 monte carlo ss

1 people found this helpful.

Yes.I read where they have this misfiring because of fuel injection clogged. I seen light sparks coming from the misfiring cylinder plugs. That isn't what I'm looking for what kind of plugs to use I'm very familiar with using with the factory use.

What the factory use, this cell phone is piece of junk I'm using.


If you are seeing sparks around the spark plugs. That's your misfire. Any visible spark means the spark is not getting to the tip of the plug. It's either a cracked plug or bad boots/wires. The factory plug was.Platinum 41-902 Iridium 41-993 And conventional R44LTS6 all are .60 gap

2 people found this helpful.

OK, I will try them but what explain when I change one spark plugs out yesterday what explain it went from misfiring when it want to, to 3second not wanting to crank and shutting off?

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