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Message: <blockquote data-quote="ORVietVet" data-source="post: 22156" data-attributes="member: 9438">If the valve covers are original, replace with the new design. What did the old plugs look like? The pcv problem is likely not related to the running problem unless fouling plugs but enough misfires should have triggered a CEL. If you used a generic aftermarket fuel pump, they are always suspect. Use Genuine GM, AC Delco or Delphi and should be good. Again, a live data scanner can be your friend. For quick live data info I use this and it costs $70 at Amazon, Foxwell NT301  <a href="https://www.amazon.com/FOXWELL-NT301-Professional-Enhanced-Diagnostic/dp/B00UJV3E12/ref=sr_1_1_sspa?crid=1KK12EZFDUSYJ&dib=eyJ2IjoiMSJ9.8otINPbs7i_iJPzT1Nv1ZXbXD-CP1-EDEIUtpqg18mBB7hDm3QKJ_0I6O9cSxRVIvE6y_K1wv3CtbU1iqDpDXs2-1isMBMmb4p10mVkRxAjAhyK2WXlPCtyyvcxMQf6VT6xEntqMXHVMSCaDHH-fp4D6uWr0Pl_sQJ1NX-Z3M1gT1gZgs2gtj6B8iCpPbv3-ZLDMVkIf6OZPzd7iECO8sKt7YITV6ZcDpFchRmyDAyPoc8VDNrpAChYrOdk1dix6lW2JSDuN-ZRD3McvB55rfyXAakZzjKyLQRe-1eK_RPQ.wTI_p0IFB25c-Vi3IlhfZs858SGIZWW4MeMhwz4RYGI&dib_tag=se&keywords=foxwell+nt301&qid=1742833708&sprefix=foxwell+%2Caps%2C190&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1" target="_blank">https://www.amazon.com/FOXWELL-NT301-Professional-Enhanced-Diagnostic/dp/B00UJV3E12/ref=sr_1_1_sspa?crid=1KK12EZFDUSYJ&dib=eyJ2IjoiMSJ9.8otINPbs7i_iJPzT1Nv1ZXbXD-CP1-EDEIUtpqg18mBB7hDm3QKJ_0I6O9cSxRVIvE6y_K1wv3CtbU1iqDpDXs2-1isMBMmb4p10mVkRxAjAhyK2WXlPCtyyvcxMQf6VT6xEntqMXHVMSCaDHH-fp4D6uWr0Pl_sQJ1NX-Z3M1gT1gZgs2gtj6B8iCpPbv3-ZLDMVkIf6OZPzd7iECO8sKt7YITV6ZcDpFchRmyDAyPoc8VDNrpAChYrOdk1dix6lW2JSDuN-ZRD3McvB55rfyXAakZzjKyLQRe-1eK_RPQ.wTI_p0IFB25c-Vi3IlhfZs858SGIZWW4MeMhwz4RYGI&dib_tag=se&keywords=foxwell+nt301&qid=1742833708&sprefix=foxwell+,aps,190&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1</a>If I really need to get deep in a vehicle, I have an Autel scanner I use.</blockquote>