i drive a 95 blazer 4.3 with 170k and it recently started doing this, under acceleration ill hear some popping from the exhaust and some slight hesitation plus my tachometer will go crazy i.e. will fluctuate from where my rpms should be to 1k over where it should be. any help or hints would be great

 

got an ses light on?

 

no check engine. also just replaced all 6 spark plugs last month

 

what did you replace them with ?

 

Check your distributor cap and rotor. Check your plug wires with it running in the dark
Have you done anything else to it recently.. or had any other incidents? Trouble starting after rain during night, etc...

Did it start very minor and getting worse?

 

i got ac delco plugs after i was getting a misfire code from the ecu and yes it progressively got worse

 

I think a decent tune up will work

Id change cap rotor wires id use ac delco for cap and rotor ac delco wires are good also

I mean it dont hurt to change them

 

okay so i replaced the cap and rotor with ac delco parts and still no luck. still running rough, i also replaced the fuel filter cause i was bored. still running like crap... should i be checking injectors now?

 

i say go with a fuel pressure test

Check this artical out

https://blazerforum.com/forum/tech-a...agnosis-23038/

 

mines a 95. any difference?