We prove that sums of length about $q^{3/2}$ of Hecke eigenvalues of automorphic forms on $SL_3(Zz)$ do not correlate with $q$-periodic functions with bounded Fourier transform. This generalizes the earlier results of Munshi and Holowinsky--Nelson, corresponding to multiplicative Dirichlet characters, and applies in particular to trace functions of small conductor modulo primes.
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