i have the same problme at idle speeds only with my 87 22R-E, it has new fuel pump and filter and pvc and plugs and wires and cap and rotor and some other things, and i found one bad small vacuum hose and i evnew tried runnning without EGR valve.,
i checked vacuum reading at idle and founf 20 inches of vacuum with distributor turned all way advanced it needed more but cant turn anymore
whats this mean ?
and the guage needle steadily misses in a coupel inches range withing the 18-22 range, miss miss miss miss
runs fine above idle very strong the trucvk will haul ass and never use or leak anything or smoke or anything like that, 126K miles all original with auto trans
body is shot, no rockers or anything left intact, bed is severely rotted,
drives like new, can run her very fast on freeway it steers and holds its own with one finger on wheel
wish it would idle
the injectors are about thge only thing untouched AFAIK
fuel injector cleaner ?
but wouldnt it be bad higher RPM too ?
good luck man, i think we are screwed,
just gonna run this oen til it blows up i guess,.
its already been ressurected once, it was buried for 6 yhears int eh ground due to dea dfuel pump,. the brakes were frozen all around they had to buy all new rotors and everything so it could roll again