hi there,
the other day i was driving and my sub started to hesitate when i was sitting still but the rpm didnt drop any at all.i thought it might have been a fuel filter but i replaced and also did new wires and plugs and a fuel pressure regulator also.I am now having a service engine light and its hesitating harder then it did before .im in need of any sugesstions i was thinking maybe a vaccume leak in my system but if any body has experienced this problem and has a solution please write me back with all answers and information to get correct parts .
Thank you for your time,
Flawdafred

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Go by an auto parts store and ask them to read the codes. The service engine light means there's a problem and the code will tell you what the problem is. All the national chains, Autozone, Oreilly's, Advance Auto, etc will read the codes for free for you. Tell us what the code or codes are and maybe someone can help you.

 

thanx ron i will and then i will repost the results that i get back from them.

 

I am curious to see what the problem was. I think I may have the same problem. My suburban service light came on and all the code states is random multiple misfire. I have change the plugs and wires and even my mechanic has no idea. Please let me know what you discovered.

 

Most likely a leaky intake manifold gasket.