alicesage
Newbie
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hi y'all, my new to me 94 k1500 5.7l is having a few issues that i need to fix before she becomes my full-time work truck. the truck sat mostly unused for 4 years before i bought her a month ago. a mechanic friend did a full tuneup recently and i changed the oil on the way home after buying it. it stalled out on me at a light, had a tough time starting back up, and then we limped to the quick lube for an oil change. the oil was clean and at the appropriate level but had last been changed 3000 miles ago in 2021. it has a cracked exhaust manifold which i'm planning on replacing soon. it's been running mostly fine after that aside from a few annoying issues.
i'm currently struggling with my engine stalling out on me and dying when i come to a stop and take my foot off the gas pedal. it doesn't happen all the time, but it's happened enough times to make me paranoid. when this happens i shift into park, let it sit for a few seconds and then restart the truck. it's been struggling a little with cold starts and sluggish acceleration as well. i'm going to buy a scan tool this week, but in the meantime i used a paper clip to read the codes this afternoon. it displayed a 15 and 42 before I drove it for a short errand (without issue) and displayed the same codes when i got back. i haven't been able to find any vacuum leaks and the iac and pcv valve were replaced during the tuneup. there's no smoke coming from anywhere there shouldn't be smoke and the oil levels are fine.
i don't have a ton of experience working on cars aside from basic maintenance, but i work in construction and have some tools and a harbor freight a few miles away if needed. i rent so i don't have a garage but i do have a walmart parking lot and a parts store next door. my friend hasn't been able to diagnose the issue but suspects it could be the fuel pump or ignition control module. any advice for where to start?